#include <bits/stdc++.h>
#pragma GCC optimize ("O2,unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int MAXN=300010, LOG=20;
int n, m, k, u, v, x, y, t, a, b, ans;
int QA[MAXN], QB[MAXN];
int segl[MAXN<<2], segr[MAXN<<2];
pii seg[LOG][MAXN];
int fen[LOG][MAXN];
vector<int> Q[MAXN];
string S, typ[MAXN];
set<int> st;
void Build(int h, int id, int tl, int tr){
if (tr-tl==1){
segr[id]=segl[id];
for (int i:Q[tl]) seg[h][segr[id]++]={QB[i], i};
sort(seg[h]+segl[id], seg[h]+segr[id]);
}
else{
int mid=(tl+tr)>>1;
segl[id<<1]=segl[id];
Build(h+1, id<<1, tl, mid);
segl[id<<1 | 1]=segr[id<<1];
Build(h+1, id<<1 | 1, mid, tr);
for (int i=segl[id<<1]; i<segr[id<<1 | 1]; i++) seg[h][i]=seg[h+1][i];
segr[id]=segr[id<<1 | 1];
sort(seg[h]+segl[id], seg[h]+segr[id]);
// merge(seg[h+1]+segl[id<<1], seg[h+1]+segr[id<<1], seg[h+1]+segl[id<<1 | 1], seg[h+1]+segr[id<<1 | 1], seg[h]+segl[id]);
}
}
inline void add(int h, int pos, int val){
for (; pos<MAXN; pos+=pos&-pos) fen[h][pos]+=val;
}
inline int get(int h, int pos){
int res=0;
for (; pos; pos-=pos&-pos) res+=fen[h][pos];
return res;
}
void Add(int h, int id, int tl, int tr, int l, int r, int ll, int rr, int val){
if (r<=tl || tr<=l) return ;
if (l<=tl && tr<=r){
int pl=lower_bound(seg[h]+segl[id], seg[h]+segr[id], pii(ll, 0))-seg[h];
int pr=upper_bound(seg[h]+segl[id], seg[h]+segr[id], pii(rr, inf))-seg[h];
// for (int i=segl[id]; i<segr[id]; i++) debugp(seg[h][i])
add(h, pl, +val);
add(h, pr, -val);
return ;
}
int mid=(tl+tr)>>1;
Add(h+1, id<<1, tl, mid, l, r, ll, rr, val);
Add(h+1, id<<1 | 1, mid, tr, l, r, ll, rr, val);
}
int Get(int h, int id, int tl, int tr, int i){
if (QA[i]<tl || tr<=QA[i]) return 0;
int res=get(h, lower_bound(seg[h]+segl[id], seg[h]+segr[id], pii(QB[i], i))-seg[h]);
if (tr-tl==1) return res;
int mid=(tl+tr)>>1;
return res+Get(h+1, id<<1, tl, mid, i) + Get(h+1, id<<1 | 1, mid, tr, i);
}
bool check(int l, int r){
for (int i=l; i<r; i++) if (S[i]=='0') return 0;
return 1;
return (*st.lower_bound(l))==(*st.lower_bound(r));
}
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
cin>>n>>m>>S;
for (int i=1; i<=m; i++){
cin>>typ[i]>>QA[i];
if (typ[i]=="query"){
cin>>QB[i];
Q[QA[i]].pb(i);
}
}
segl[1]=1;
Build(0, 1, 1, n+1);
S="0"+S+"0";
for (int i=0; i<=n+1; i++) if (S[i]=='0') st.insert(i);
for (int i=1; i<=m; i++){
if (typ[i]=="query"){
ans=Get(0, 1, 1, n+1, i);
if (check(QA[i], QB[i])) ans+=i;
cout<<ans<<"\n";
continue ;
}
int pos=QA[i];
if (S[pos]=='0'){
auto it=st.lower_bound(pos);
int x=*--it;
++it;
int y=*++it;
// cerr<<"Add "<<x+1<<" "<<pos+1<<" "<<pos+1<<" "<<y+1<<" \n";
Add(0, 1, 1, n+1, x+1, pos+1, pos+1, y+1, -i);
S[pos]='1';
st.erase(pos);
}
else{
auto it=st.lower_bound(pos);
int y=*it;
int x=*--it;
Add(0, 1, 1, n+1, x+1, pos+1, pos+1, y+1, +i);
S[pos]='0';
st.insert(pos);
}
}
return 0;
}
/*
5 7
11011
query 1 2
query 1 2
query 1 6
query 3 4
toggle 3
query 3 4
query 1 6
*/
