#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <set>
using namespace std;
using vi = vector<int>;
using vvi = vector<vi>;
using pii = pair<int, int>;
using vpii = vector<pii>;
const int mx = 100;
int n, q;
int s[1+mx];
set<int> offpoints;
int Z = (1<<19);
struct stamp_tree
{
vi stamp = vi(Z<<1, 0);
void set(int l, int r, int t)
{
l += Z;
r += Z+1;
while(l < r)
{
if(l & 1) stamp[l++] = t;
if(r & 1) stamp[--r] = t;
l >>= 1;
r >>= 1;
}
}
int query(int i)
{
int ans = 0;
for(i += Z; i >= 1; i >>= 1) ans = max(ans, stamp[i]);
return ans;
}
};
stamp_tree stt;
vvi total_time = vvi(1+mx, vi(1+mx, 0));
int get_value(int l, int r)
{
return total_time[l][r];
}
int range_add(int l, int r, int x, int y, int v)
{
for(int i = l; i <= r; i++)
for(int j = x; j <= y; j++)
total_time[i][j] += v;
}
void add_triangle(int l, int r, int t)
{
// for(int i = l; i <= r; i++)
// for(int j = l; j <= r; j++)
// toggle_stamp[i][j] = t;
stt.set(l, r, t);
}
void remove_triangle(int l, int r, int t)
{
int tt = stt.query(l);
range_add(l, r, l, r, t - tt);
}
void switch_on(int i, int t)
{
offpoints.erase(i);
auto it = offpoints.lower_bound(i);
int r = *it;
it--;
int l = *it;
remove_triangle(l+1, i-1, t);
remove_triangle(i+1, r-1, t);
add_triangle(l+1, r-1, t);
}
void switch_off(int i, int t)
{
auto it = offpoints.lower_bound(i);
int r = *it;
it--;
int l = *it;
offpoints.insert(i);
remove_triangle(l+1, r-1, t);
add_triangle(l+1, i-1, t);
add_triangle(i+1, r-1, t);
}
int query(int l, int r, int t)
{
int y = *offpoints.lower_bound(l);
if(y > r) return get_value(l, r) + t - stt.query(l);
else return get_value(l, r);
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> q;
string t;
cin >> t;
for(int i = 0; i < n; i++)
s[i+1] = (t[i] == '1');
for(int i = 1; i <= n; i++)
if(s[i] == 0)
offpoints.insert(i);
offpoints.insert(0);
offpoints.insert(n+1);
for(int j = 1; j <= q; j++)
{
string qr;
cin >> qr;
if(qr == "toggle")
{
int i;
cin >> i;
if(s[i] == 0)
{
s[i] = 1;
switch_on(i, j);
}
else
{
s[i] = 0;
switch_off(i, j);
}
}
else
{
int a, b;
cin >> a >> b;
cout << query(a, b-1, j) << '\n';
}
}
}
