#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n'
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define in(v,x) (v.find(x) != v.end())
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;
const int MAXN = 3e5+1;
int n,q;
string S;
int w[MAXN], old[MAXN], cnt[MAXN];
pair<bool,PII> qrs[MAXN];
int st[MAXN*4];
void update(int s, int tl, int tr, int idx, int val) {
if (tl == tr) st[s] = val;
else {
int tm = (tl+tr)/2;
if (idx <= tm) update(s*2,tl,tm,idx,val);
else update(s*2+1,tm+1,tr,idx,val);
st[s] = max(st[s*2], st[s*2+1]);
}
}
int query(int s, int tl, int tr, int l, int r) {
if (l <= tl && r >= tr) return st[s];
else {
int tm = (tl+tr)/2;
int cur = -INF;
if (l <= tm) cur = max(cur,query(s*2,tl,tm,l,r));
if (r > tm) cur = max(cur,query(s*2+1,tm+1,tr,l,r));
return cur;
}
}
signed main() {
OPTM;
cin >> n >> q >> S;
FOR(i,0,n) update(1,0,n-1,i,INF);
FOR(i,0,n) if (S[i] == '1') update(1,0,n-1,i,-1);
FOR(i,0,q) {
string t; cin >> t;
if (t == "toggle") {
int x; cin >> x;
x--;
update(1,0,n-1,x,i);
}
else {
int a,b; cin >> a >> b;
a--; b--;
int res = query(1,0,n-1,a,b);
if (res == INF) cout << 0;
else cout << i-res;
cout << ln;
}
}
}
