#include <bits/stdc++.h>
using namespace std;
#define int long long
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
void Solve()
{
int n, q;
cin >> n >> q;
vector<vector<int> > dist(n + 1, vector<int> (n + 1, 0));
string s;
cin >> s;
for(int i = 0; i <= n; i++)
{
bool flag = true;
for(int j = i + 1; j <= n; j++)
{
if(s[j - 1] == '0') flag = false;
dist[i][j] = (flag) ? dist[i][j] + 1 : dist[i][j];
}
}
for(int i = 0; i < q; i++)
{
string command;
cin >> command;
if(command == "query")
{
int a, b;
cin >> a >> b;
a--, b--;
cout << dist[a][b] << "\n";
}
else
{
int idx;
cin >> idx;
idx--;
s[idx] = (s[idx] == '1') ? '0' : '1';
}
for(int j = 0; j <= n; j++)
{
bool flag = true;
for(int k = j + 1; k <= n; k++)
{
if(s[k - 1] == '0') flag = false;
dist[j][k] = (flag) ? dist[j][k] + 1 : dist[j][k];
}
}
}
}
int32_t main()
{
auto begin = std::chrono::high_resolution_clock::now();
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
// cin >> t;
for(int i = 1; i <= t; i++)
{
//cout << "Case #" << i << ": ";
Solve();
}
auto end = std::chrono::high_resolution_clock::now();
auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
return 0;
}
