#include <bits/stdc++.h>

using namespace std;

#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

#define ll long long
#define ld long double
#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define FOR(i,l,r) for(int i=(l);i<=(r);i++)
#define ROF(i,r,l) for(int i=(r);i>=(l);i--)
int inf=1000000007;
ll infl=1000000000000000007;
ll mod=1000000007;
ll mod1=998244353;

const int N=107;

bool is[N];
int ans[N][N];

signed main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n,q;
	cin>>n>>q;
	string s;
	cin>>s;
	FOR(i,1,n) is[i]=s[i-1]-'0';
	FOR(i,1,q)
	{
		FOR(a,1,n)
		{
			FOR(b,a,n)
			{
				if(!is[b]) break;
				ans[a][b]++;
			}
		}
		string s;
		cin>>s;
		if(s[0]=='t')
		{
			int x;
			cin>>x;
			is[x]^=1;
		}
		else
		{
			int a,b;
			cin>>a>>b;
			cout<<ans[a][b-1]<<endl;
		}
	}
	
	
	
	return 0;
}