#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<(x.F)<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
#define int ll
const int N=6e5+99;
int n,q,a[N],b[N],ans[N],type[N];
string t;
set<int> s;
vector<int> seg[N],fenwik[N];
void addvec(int x,int y){
x+=n;
while(x){
seg[x].pb(y);
fenwik[x].pb(0);
x/=2;
}
}
void build(){
f(i,1,2*n){
sort(seg[i].begin(),seg[i].end());
seg[i].resize(unique(seg[i].begin(),seg[i].end())-seg[i].begin());
while(fenwik[i].size()>seg[i].size()) fenwik[i].pop_back();
}
}
void add(int id,int x,int val){
//cout<<id<<" "<<x<<" "<<val<<endl;
//dbgv(seg[id]);
//cout<<id<<" "<<x<<" "<<val<<endl;
f(i,1,seg[id].size()){
if(seg[id][i]>=x){
//cout<<id<<" --> "<<i<<endl;
fenwik[id][i]+=val;
}
}
return ;
x=lower_bound(all(seg[id]),x)-seg[id].begin();
for(;x<fenwik[id].size();x+=(x&-x)){
fenwik[id][x]+=val;
}
//eror(fenwik[id].back());
}
void Add(int l,int r,int L,int R,int val){
for(l+=n,r+=n;l<r;l>>=1,r>>=1){
if(l&1){
add(l,L,val);
add(l,R,-val);
l++;
}
if(r&1){
r--;
add(r,L,val);
add(r,R,-val);
}
}
}
int get(int x,int y){
/*f(i,1,seg[x].size()){
if(seg[x][i]==y){
return fenwik[x][i];
}
}
assert(0);*/
//sort(all(seg[x]));
int res=0;
y=lower_bound(all(seg[x]),y)-seg[x].begin();
return fenwik[x][y];
for(;y>0;y-=y&-y){
res+=fenwik[x][y];
}
return res;
}
int Get(int x,int y){
int res=0;
x+=n;
while(x){
res+=get(x,y);
x/=2;
}
return res;
}
main(){
ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
cin>>n>>q>>t;
s.insert(-1);
s.insert(n);
f(i,0,n) if(t[i]=='0') s.insert(i);
f(i,1,2*n) seg[i].pb(-1),fenwik[i].pb(0);
f(i,1,q+1){
string s;
cin>>s;
if(s[0]=='t'){
type[i]=1;
cin>>a[i]; a[i]--;
}
else{
type[i]=2;
cin>>a[i]>>b[i]; a[i]--,b[i]-=2;
addvec(a[i],b[i]);
}
}
build();
f(i,1,q+1){
if(type[i]==1){
int l=(*prev(s.lower_bound(a[i])))+1,r=(*s.upper_bound(a[i]))-1;
if(s.find(a[i])!=s.end()){
s.erase(a[i]);
Add(l,a[i]+1,a[i],r+1,-i);
f(j,1,q+1){
if(type[j]==2 && l<=a[j] && a[j]<=a[i] && a[i]<=b[j] && b[j]<=r){
ans[j]-=i;
}
}
}
else{
s.insert(a[i]);
Add(l,a[i]+1,a[i],r+1,i);
f(j,1,q+1){
if(type[j]==2 && l<=a[j] && a[j]<=a[i] && a[i]<=b[j] && b[j]<=r){
ans[j]+=i;
}
}
}
}
else{
int res=Get(a[i],b[i]);
if((*s.lower_bound(a[i]))>b[i]){
res+=i;
ans[i]+=i;
}
cout<<res<<'\n';
}
}
}
/*
2 3
00
t 1
t 2
q 1 3
2 2
00
t 1
q 1 3
5 2
11011
toggle 3
query 1 6
*/
