#include <bits/stdc++.h>
#define ar array
//#define int long long
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
signed main() {
ios_base::sync_with_stdio(false);
cout.tie(0); cin.tie(0);
int n, q; cin >> n >> q;
string s; cin >> s;
s = "." + s;
vector<string> vec; vec.push_back(s);
while(q--) {
string t; cin >> t;
if(t[0] == 'q') {
int ans = 0, l, r; cin >> l >> r;
for(string st : vec) {
bool ok = 1;
for(int i=l; i<r&&ok; i++) if(st[i] == '0') ok = 0;
ans += ok;
}
cout << ans << '\n';
} else {
int p; cin >> p;
if(s[p] == '0') s[p] = '1';
else s[p] = '0';
}
vec.push_back(s);
}
return 0;
}
