#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"
// ==========================(debug)============================================================================================== //
#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _printn(x); cerr << nli;
#else
#define debug(x)
#endif
void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
// ==========================(debug)============================================================================================== //
ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 3e5+5;
const ll mod = 1e9+7;
// ==========================(MOD)=============================================================================================== //
ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }
// ==========================(MOD)=============================================================================================== //
bool f = false;
bool a[mx];
ll q;
string k;
ll start[mx];
typedef struct SEGMENT_TREE{
vi arr;
ll range;
void init(ll a){
range = log2(a);
range = 1 << (range + 3);
arr.resize(range);
return;
}
ll construct(ll ptr,ll l,ll r){
if(l==r){
arr[ptr] = start[l];
return arr[ptr];
}
ll mid = l + (r-l) / 2;
arr[ptr] = max(construct(2*ptr,l,mid),construct(2*ptr+1,mid+1,r));
return arr[ptr];
}
ll query(ll ptr,ll l,ll r,ll st,ll en){
if(l > en || r < st)
return 0;
if(l>=st && r<=en)
return arr[ptr];
ll mid = l + (r-l)/2;
return max(query(2*ptr,l,mid,st,en),query(2*ptr+1,mid+1,r,st,en));
}
ll update(ll ptr,ll l,ll r,ll val,ll pos){
if(l==r && r==pos){
start[l] = val;
arr[ptr] = val;
return arr[ptr];
}
if(l > pos || r < pos)
return arr[ptr];
ll mid = l + (r-l)/2;
arr[ptr] = max(update(2*ptr,l,mid,val,pos),update(2*ptr+1,mid+1,r,val,pos));
return arr[ptr];
}
void debugg(ll ptr,ll l,ll r){
cout<<ptr<<" "<<l<<" "<<r<<""<< " "<<arr[ptr]<<nli;
if(l==r)
return;
ll mid = l + (r-l)/2;
debugg(2*ptr,l,mid);
debugg(2*ptr+1,mid+1,r);
}
}SGT;
SGT sgt;
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
// #ifndef ONLINE_JUDGE
// freopen("input1.txt", "r", stdin);
// freopen("output1.txt", "w", stdout);
// freopen("error1.txt", "w", stderr);
// #endif // ONLINE_JUDGE
cin>>n>>q;
cin>>k;
fip(0,n)
a[i] = (k[i]=='1') ? 1 : 0;
ll sr,de;
fip(0,n)
start[i] = (k[i]=='1') ? 0 : 1e9;
sgt.init(n);
sgt.construct(1,0,n-1);
// sgt.debugg(1,0,n-1);
// fip(0,n)
// cout<<sgt.query(1,0,n-1,i,i)<<nli;
fip(1,q+1){
cin>>k;
if(k == "query"){
cin>>sr>>de;
sr--,de--;
tp = sgt.query(1,0,n-1,sr,de-1);
// cout<<tp<<" "<<i<<nli;
if(tp>i)
cout<<0<<nli;
else
cout<<i-tp<<nli;
}
else{
// mark[i] = 1;
cin>>sr;
sr--;
a[sr] = 1;
sgt.update(1,0,n-1,i,sr);
}
}
// fip(0,n)
// cout<<total[i]<<" ";
// cout<<nli;
// fip(0,n)
// cout<<start[i]<<" ";
// cout<<nli;
// cout<<"ok";
// cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
return 0;
}
