#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define ld double
#define ll __int128
mt19937 rnd(51);
const int INF = 1e18;
signed main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
#endif // LOCAL
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, q;
cin >> n >> q;
vector<int> s(n);
for (int i = 0; i < n; i++) {
char c;
cin >> c;
s[i] = c - '0';
}
vector<int> time(n);
vector<vector<pair<int,int>>> seg(n), need(n);
vector<int> ans(q);
for (int i = 0; i < q; i++) {
string t;
cin >> t;
if (t == "toggle") {
int j;
cin >> j;
j--;
if (s[j] == 0) {
seg[j].pb({time[j], i});
}
time[j] = i + 1;
s[j] ^= 1;
ans[i] = -1;
} else {
int l, r;
cin >> l >> r;
l--, r -= 2;
need[l].pb({r, i});
ans[i] = i + 1;
}
}
for (int i = 0; i < n; i++) {
if (s[i] == 0) {
seg[i].pb({time[i], q - 1});
}
}
vector<int> val(q, INF);
for (int i = n - 1; i >= 0; i--) {
for (auto to : seg[i]) {
for (int j = to.first; j <= to.second; j++) {
val[j] = i;
}
}
for (auto to : need[i]) {
for (int j = 0; j <= to.second; j++) {
if (val[j] <= to.first) {
ans[to.second]--;
}
}
}
}
for (int i = 0; i < q; i++) {
if (ans[i] != -1) {
cout << ans[i] << endl;
}
}
return 0;
}
