#pragma GCC optimize("unroll-loops,Ofast,O3")
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define spc << " " <<
#define endl "\n"
#define all(x) x.begin(), x.end()
#define int long long
#define ii pair<long long,int>
#define vi vector<int>
#define vii vector<ii>
#define st first
#define nd second
#define mid (l+r)/2
#define inf 1e15
#define MOD 1000000007
#define MX 300005
using namespace std;
int n,q;
struct segtree{
vi tree;
segtree(){
tree.resize(2*MX,0);
}
void update(int v, int l, int r, int pos, int val){
if(l>r) return;
if(l==r){
tree[v]=val;
return;
}
if(pos<=mid){
update(v+1, l, mid, pos, val);
}
else{
update(v+2*(mid-l+1), mid+1, r, pos, val);
}
tree[v]=max(tree[v+1], tree[v+2*(mid-l+1)]);
}
int query(int v, int l, int r, int ql, int qr){
if(l>qr || r<ql) return 0;
if(l>=ql && r<=qr) return tree[v];
return max(query(v+1, l, mid, ql, qr), query(v+2*(mid-l+1), mid+1, r, ql, qr));
}
};
void solve(){
cin >> n >> q;
string s; cin >> s;
segtree seg;
if(n>100 || q>100){
int tot[n+1], last[n+1], cur[n+1];
int tim[n+1];
for(int i=1; i<=n; i++){
tot[i]=last[i]=tim[i]=0;
cur[i]=s[i-1]-'0';
if(s[i-1]=='0'){
tim[i]=inf;
seg.update(1, 1, n, i, inf);
}
}
for(int i=1; i<=q; i++){
cin >> s;
if(s[0]=='t'){
int a; cin >> a;
if(cur[a]==0){
last[a]=i;
}
else{
tot[a]+=i-last[a];
}
cur[a]=1-cur[a];
seg.update(1, 1, n, a, i);
}
else{
int l,r; cin >> l >> r;
int ans=tot[l];
if(cur[l]) ans+=i-last[l];
if(l==r-1)cout << ans << endl;
else{
ans=seg.query(1, 1, n, l, r-1);
if(ans==inf) cout << 0 << endl;
else cout << i-ans << endl;
}
}
}
return;
}
int arr[q+1][n+1];
for(int i=1; i<=n; i++){
if(s[i-1]=='0') arr[1][i]=0;
else arr[1][i]=1;
}
for(int i=1; i<=q; i++){
string h; cin >> h;
if(i<q) for(int j=1; j<=n; j++) arr[i+1][j]=arr[i][j];
if(h[0]=='t'){
int a; cin >> a;
arr[i+1][a]=1-arr[i+1][a];
}
else{
int l,r; cin >> l >> r;
int ans=0;
for(int j=1; j<=i; j++){
int ok=1;
for(int f=l; f<r; f++){
if(!arr[j][f]){
ok=0;
break;
}
}
if(ok){
ans++;
}
}
cout << ans << endl;
}
}
}
signed main(){
ios_base::sync_with_stdio(false);cin.tie(0);
#ifdef Local
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
/*freopen("nondec.in","r",stdin);
freopen("nondec.out","w",stdout);*/
int t=1;
//cin >> t;
while(t--) solve();
}
