#include <bits/stdc++.h>
using namespace std;
#define int int64_t
#define double long double
using pii = pair<int, int>;
template<typename T>
using Prior = priority_queue<T>;
template<typename T>
using prior = priority_queue<T, vector<T>, greater<T>>;
#define X first
#define Y second
#define ALL(x) (x).begin(), (x).end()
#define eb emplace_back
#define pb push_back
#define fastIO() ios_base::sync_with_stdio(false), cin.tie(0)
int32_t main() {
fastIO();
int n, q, x, l, r;
string s, op;
cin >> n >> q >> s;
vector<string> str(q + 1);
str[0] = s;
for (int i = 1; i <= q; ++i) {
cin >> op, str[i] = str[i - 1];
if (op == "toggle") {
cin >> x, --x;
str[i][x] ^= 1;
}
if (op == "query") {
cin >> l >> r, --l, --r;
int cnt = 0;
for (int j = 0; j < i; ++j) {
int fl = 1;
for (int idx = l; idx < r; ++idx) fl &= (str[j][idx] ^ '0');
cnt += fl;
}
cout << cnt << "\n";
}
}
return 0;
}
