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

int main()
{
    int t;
    cin>>t;
    for (int z=0;z<t;z++){
        int n,a,b;
        cin>>n>>a>>b;
        string r;
        cin>>r;
        int c=0;
        int v=0;
        int m=0;
        for (char x: r){
            if (x=='C') c++;
            if (x=='B') m++;
            if (x=='V') v++;
        }
        int ans=0;
        if(c*2<=a){
            a-=c*2;
            ans+=c;
        }
        else{
            ans+=a/2;
            if (a%2==1){
                a=1;
            }
            else a=0;
        }

        if (m*2<=b){
            b-=m*2;
            ans+=m;
        }
        else{
            ans+=b/2;
            if (b%2==1){
                b=1;
            }
            else b=0;
        }

        ans+=min(v,min(b,a));
        cout<<ans<<endl;
    }
}