Question_marks.C++

#include<bits/stdc++.h>
using namespace std;

int main(){
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        string s;
        cin>>s;
        int a=0,b=0,c=0,d=0;
        for(int i=0;i<s.length();i++){
            if(s[i] == 'A') 
                a++;
            if(s[i] == 'B') 
                b++;
            if(s[i] == 'C') 
                c++;
            if(s[i] == 'D') 
                d++;
        }
        cout<<min(a,n)+min(b,n)+min(c,n)+min(d,n)<<endl;
    }
}