//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int s[105][105],n,q;
bool arr[105];
signed main(){
fast
cin>>n>>q;
for (int i=1;i<=n;i++){
char c; cin>>c;
arr[i]=c-'0';
s[1][i]=arr[i]+s[1][i-1];
}
for (int t=2;t<=q+1;t++){
string str; cin>>str;
if (str=="toggle"){
int p; cin>>p;
arr[p]^=1;
}
else {
int ans=0,l,r; cin>>l>>r;
for (int i=1;i<t;i++){
if (s[i][r-1]-s[i][l-1]==r-l)
ans++;
}
cout<<ans<<'\n';
}
for (int i=1;i<=n;i++)
s[t][i]=arr[i]+s[t][i-1];
}
}
