#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define maxn
int n, q, s1[110][110];
void solve() {
string est;
cin >> n >> q >> est;
for(int i = 1; i <= n; i++) {
s1[i][0] = est[i-1]-'0';
}
for(int i = 1; i <= q; i++) {
for(int j = 1; j <= n; j++) {
s1[j][i] = s1[j][i-1];
}
string sss; cin >> sss;
if(sss == "toggle") {
int pos; cin >> pos;
s1[pos][i]^= 1;
continue;
}
int l,r; cin >> l >> r;
r--;
int ans = 0;
for(int j = 0; j < i; j++) {
int ok = 1;
for(int k = l; k <= r; k++) {
if(s1[k][j] == 0) ok = 0;
}
ans+= ok;
}
cout << ans << endl;
}
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0);
// freopen("in.in", "r", stdin);
//freopen("out.out", "w", stdout);
int tt = 1;
// cin >> tt;
while(tt--) solve();
}
