/// Template path: /home/mohammed/.config/sublime-text-3/Packages/User

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;

// typedef
typedef long long ll;
typedef long double ld;
typedef vector<int> vecint;
typedef vector<char> vecchar;
typedef vector<string> vecstr;
typedef vector<long long> vecll;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

// Marcos
#define endl ("\n")
#define int long long
#define mod 1000000007
#define pi (3.141592653589)
#define REP(i,a,b) for (int i = a; i < b; i++)
#define RREP(i,a,b) for (int i = a; i > b; i--)
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr)

// Functions
long long squared(long long x) {return (x * x) % mod;}
int factorial(int n) {long long res = 1; for (int i = 1; i <= n; i++) {res = ((res * i) % mod + mod) % mod ;} return res;}
long long power(long long x, long long p) {if (p == 0) {return 1;} if (p % 2 == 1) {return (power(x, p - 1) * x) % mod;} return squared(power(x, p / 2));}

// cout << fixed;
// cout << setprecision(4);


// ---------(^_^)--------- //


struct segtree {

	int size = 1;

	vector<int> mx;
	void init(int n) {
		while (size < n)size *= 2;
		mx.assign(2 * size, -1);

	}

	void build(vector<int>&v, int x, int  lx, int rx) {
		if (rx - lx == 1) {
			if (lx < v.size()) {
				mx[x] = v[lx];
			}
			return;
		}

		int m = (lx + rx) / 2;
		build(v, 2 * x + 1, lx, m);
		build(v, 2 * x + 2, m, rx);
		mx[x] = max(mx[2 * x + 1] , mx[2 * x + 2]);
	}

	void build(vector<int> &v) {
		build(v, 0, 0, size);
	}


	void set(int i, int v, int x, int lx, int rx) {
		if (rx - lx == 1) {
			mx[x] = v;
			return;
		}

		int m = (lx + rx) / 2;

		if (i < m) {
			set(i, v, x * 2 + 1, lx, m);
		} else {
			set(i, v, x * 2 + 2, m, rx);
		}

		mx[x] = max(mx[2 * x + 1] , mx[2 * x + 2]);
	}

	void set(int i, int v) {
		set(i, v, 0, 0, size);
	}


	int maxel (int l, int r, int x, int lx, int rx) {
		if (rx <= l || r <= lx )return -1;
		if (l <= lx && rx <= r) return mx[x];
		int m = (rx + lx) / 2;
		int n1 = maxel(l, r, x * 2 + 1, lx, m );
		int n2 = maxel(l, r, x * 2 + 2, m, rx );
		return max(n1 , n2);

	}

	int maxel(int l, int r) {
		return maxel(l, r, 0, 0, size);
	}



};



void main_solve() {
	int n, q; cin >> n >> q;
	string s; cin >> s;
	int we = q + 2;
	vector<int> v(n, we);
	for (int i = 0; i < n ; i ++) {
		if (s[i] == '1') {
			v[i] = 0;
		}
	}

	segtree st;
	st.init(n);
	st.build(v);
	int curr_time = 0;
	while (q--) {
		curr_time++;
		string type; cin >> type;

		if (type == "toggle") {
			int x; cin >> x;
			st.set(x - 1, curr_time);
		} else {
			int a, b; cin >> a >> b;
			int e = st.maxel(a - 1, b - 1);
			if (e  > curr_time) {
				cout << 0 << endl;
			} else {
				cout << curr_time - e << endl;
			}
		}



	}





}


int32_t main() {

	fast;
// #ifndef ONLINE_JUDGE
// 	freopen("input.txt", "r", stdin);
// 	freopen("output.txt", "w", stdout);
// #endif
	// Just another problem (-_-)

	int t;
	t = 1;
	// cin >> t;

	while (t--) {
		main_solve();
	}


}