#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n'
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define in(v,x) (v.find(x) != v.end())
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;
const int MAXN = 3e5+1;
int n,q;
string s;
int w[MAXN], old[MAXN], cnt[MAXN];
pair<bool,PII> qrs[MAXN];
signed main() {
OPTM;
cin >> n >> q >> s;
FOR(i,1,n+1) w[i] = s[i-1]-'0';
FOR(i,0,q) {
string t; cin >> t;
if (t == "toggle") {
int x; cin >> x;
if (w[x] == 1) cnt[x] += i+1-old[x];
else old[x] = i+1;
w[x] ^= 1;
qrs[i] = {0,{x,-1}};
}
else {
int a,b; cin >> a >> b;
int res = 0;
FOR(j,a,b) {
res += cnt[j];
if (w[j]) res += i+1-old[j];
}
cout << res << ln;
qrs[i] = {1,{a,b}};
}
}
}
