#include<bits/stdc++.h>

using namespace std;


int main(){
//freopen("in","r",stdin);
    int n;
    int q;
    int i,j,x,y,t,a[150],cnt,sum;
    cin >> n >> q;
    string s;
    cin >> s;
    for(int a0 = 0; a0 < q; a0++){
        // your code goes here
        sum=0;
        scanf("%d",&n);
        if(n==1)
        {
            scanf("%d %d %d",&x,&y,&t);
            for(i=x;i<=y;i++)
            {
                s[i]=((t%26)+s[i]-'a')%26+'a';
            }
        }
        else
        {
            memset(a,0,sizeof(a));
            scanf("%d %d",&x,&y);
            sum=0;
            for(i=x;i<=y;i++)
            {
                a[s[i]]++;


            }
            for(i='a';i<='z';i++)
            {
                sum+=(a[i]*(a[i]+1)/2);

                cnt=0;
                if(a[i]!=0 && a[i]%2==0)
                {
                    cnt=1;
                    for(j='a';j<='z';j++)
                    {
                        if(a[j]%2==0 && a[j])
                        {
                            cnt*=a[j]/2;
                        }
                        else if(a[j])
                            cnt*=a[j];
                    }
                     sum+=cnt;
                    // cout<<cnt<<endl;
                }

            }
             cout<<sum<<endl;
        }


    }
    return 0;
}