/*
* Author: Nonoze
* Created: Friday 20/02/2026
*/
#include <bits/stdc++.h>
using namespace std;
#ifndef DEBUG
#define dbg(...)
#endif
// #define cout cerr << "OUT: "
#define endl '\n'
#define endlfl '\n' << flush
#define quit(x) return (void)(cout << x << endl)
template<typename T> void read(T& x) { cin >> x; }
template<typename T1, typename T2> void read(pair<T1, T2>& p) { read(p.first), read(p.second); }
template<typename T> void read(vector<T>& v) { for (auto& x : v) read(x); }
template<typename T1, typename T2> void read(T1& x, T2& y) { read(x), read(y); }
template<typename T1, typename T2, typename T3> void read(T1& x, T2& y, T3& z) { read(x), read(y), read(z); }
template<typename T1, typename T2, typename T3, typename T4> void read(T1& x, T2& y, T3& z, T4& zz) { read(x), read(y), read(z), read(zz); }
template<typename T> void print(vector<T>& v) { for (auto& x : v) cout << x << ' '; cout << endl; }
#define sz(x) (int)(x.size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define make_unique(v) sort(all(v)), v.erase(unique(all(v)), (v).end())
#define pb push_back
#define mp(a, b) make_pair(a, b)
#define fi first
#define se second
#define cmin(a, b) a = min(a, b)
#define cmax(a, b) a = max(a, b)
#define YES cout << "YES" << endl
#define NO cout << "NO" << endl
#define QYES quit("YES")
#define QNO quit("NO")
// #define int long long
#define double long double
const int inf = numeric_limits<int>::max() / 4;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MOD = 1e9+7, LOG=20;
void solve();
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
int tt=1;
// cin >> tt;
while(tt--) solve();
return 0;
}
template<class T>
struct simplesegtree {
vector<T> st;
int n;
T idElement;
simplesegtree() {}
simplesegtree(int nn, T idEl, vector<T> creation={}) {
n=nn, idElement=idEl;
st.resize(n*2, idElement);
if (!creation.empty()) {
for (int i=0; i<n; i++) st[i+n]=creation[i];
build();
}
}
void build() {
for (int i=n-1; i>0; i--) st[i] = combine(st[i<<1], st[i<<1|1]);
}
void update(int p, T val) {
for (st[p += n] = val; p > 1; p >>= 1) st[p>>1] = combine(st[p], st[p^1]);
}
T query(int l, int r) {
T resl = idElement, resr = idElement;
r++;
for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
if (l&1) resl = combine(resl, st[l++]);
if (r&1) resr = combine(st[--r], resr);
}
return combine(resl, resr);
}
T combine(T l, T r) {
T ans=l+r;
return ans;
}
};
struct node {
int cnt, is;
node (): cnt(0), is(-1) {}
};
struct segtree1D {
int n;
vector<node> t;
vector<int> vals;
segtree1D(): n(0) {}
segtree1D(int _n) {
n=_n;
t.resize(4*n);
}
void build(int idx, int l, int r, vector<int>& a) {
if (l==r) {
t[idx].is=a[l];
vals.pb(a[l]);
return;
}
int mid=(l+r)/2;
build(2*idx, l, mid, a);
build(2*idx+1, mid+1, r, a);
}
void build(int idx, int l, int r, vector<int>& a, vector<int>& b) {
if (l==r) {
if (l<sz(a)) t[idx].is=a[l];
else t[idx].is=b[l-sz(a)];
vals.pb(t[idx].is);
return;
}
int mid=(l+r)/2;
build(2*idx, l, mid, a, b);
build(2*idx+1, mid+1, r, a, b);
}
void update(int idx, int l, int r, int ql, int qr, int val) {
if (qr<l || r<ql) return;
if (ql<=l && r<=qr) {
t[idx].cnt+=val;
return;
}
int mid=(l+r)/2;
update(2*idx, l, mid, ql, qr, val);
update(2*idx+1, mid+1, r, ql, qr, val);
}
int query(int idx, int l, int r, int point) {
if (point<l || r<point) return 0;
if (l==r) return t[idx].cnt;
int mid=(l+r)/2;
return t[idx].cnt+query(2*idx, l, mid, point)+query(2*idx+1, mid+1, r, point);
}
void update(int ql, int qr, int val) {
auto lb=lower_bound(all(vals), ql)-vals.begin();
auto ub=upper_bound(all(vals), qr)-vals.begin()-1;
update(1, 0, n-1, lb, ub, val);
}
int query(int point) {
point=lower_bound(all(vals), point)-vals.begin();
return query(1, 0, n-1, point);
}
};
struct segtree2D {
int n;
vector<segtree1D> t;
segtree2D(int _n) {
n=_n;
t.resize(4*n);
}
void build(int idx, int l, int r, vector<vector<int>>& a) {
if (l==r) {
if (a[l].empty()) return;
t[idx]=segtree1D(sz(a[l]));
t[idx].build(1, 0, sz(a[l])-1, a[l]);
return;
}
int mid=(l+r)/2;
build(2*idx, l, mid, a);
build(2*idx+1, mid+1, r, a);
if (t[2*idx].n+t[2*idx+1].n==0) return;
t[idx]=segtree1D(t[2*idx].n+t[2*idx+1].n);
t[idx].build(1, 0, t[idx].n-1, t[2*idx].vals, t[2*idx+1].vals);
}
void update(int idx, int l, int r, int ql, int qr, int v1, int v2, int val) {
if (qr<l || r<ql) return;
if (ql<=l && r<=qr) {
t[idx].update(v1, v2, val);
return;
}
int mid=(l+r)/2;
update(2*idx, l, mid, ql, qr, v1, v2, val);
update(2*idx+1, mid+1, r, ql, qr, v1, v2, val);
}
int query(int idx, int l, int r, int point, int p2) {
if (point<l || r<point) return 0;
if (l==r) return t[idx].query(p2);
int mid=(l+r)/2;
return t[idx].query(p2)+query(2*idx, l, mid, point, p2)+query(2*idx+1, mid+1, r, point, p2);
}
void update(int ql, int qr, int v1, int v2, int val) {
update(1, 0, n-1, ql, qr, v1, v2, val);
}
int query(int point, int p2) {
return query(1, 0, n-1, point, p2);
}
};
int n, k, m, q;
vector<int> a;
void solve() {
read(n, q); n++;
string s; cin >> s;
for (auto u: s) a.pb(u-'0');
vector<vector<int>> queries;
for (int j=0; j<q; j++) {
cin >> s;
if (s=="toggle") {
int i; cin >> i; i--;
queries.pb({0, i});
} else {
int x, y; cin >> x >> y; x--, y--;
queries.pb({1, x, y});
}
}
vector<vector<int>> vals(n);
for (int i=0; i<q; i++) if (queries[i][0]==1) vals[queries[i][1]].pb(queries[i][2]);
for (int i=0; i<n; i++) make_unique(vals[i]);
segtree2D st(n);
st.build(1, 0, n-1, vals);
simplesegtree<int> st2(n, 0);
int lborn=0;
for (int i=0; i<n-1; i++) {
if (a[i]) {
st2.update(i, 1);
st.update(lborn, i, i+1, i+1, -1);
} else lborn=i+1;
}
for (int i=0; i<q; i++) {
if (queries[i][0]==0) {
int pos=queries[i][1];
int lborn=pos-1, rborn=pos+1;
{
int l=0, r=pos-1, ans=pos;
while (l<=r) {
int mid=(l+r)/2;
if (st2.query(mid, pos-1) == pos-mid) ans=mid, r=mid-1;
else l=mid+1;
}
lborn=ans;
}
{
int l=pos+1, r=n-2, ans=pos;
while (l<=r) {
int mid=(l+r)/2;
if (st2.query(pos+1, mid) == mid-pos) ans=mid, l=mid+1;
else r=mid-1;
}
rborn=ans+1;
}
st.update(lborn, pos, pos+1, rborn, (i+2)*(a[pos]?1:-1));
a[pos]^=1;
st2.update(pos, a[pos]);
} else {
int x=queries[i][1], y=queries[i][2];
int ans=st.query(x, y) + (st2.query(x, y-1) == y-x?1:0) * (i+2);
cout << ans << endl;
}
}
}
