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

int main(){
	int n; cin >> n; int sol[n];
	for(int i=0; i<n; i++){
		int v, c, b;
		cin >> v >> c >> b;
		int vo=0; int bo=0; int co=0;
		string rend; cin >> rend;
		for(int i=0; i<v; i++){
			if(rend[i] == 'V') vo++;
			if(rend[i] == 'B') bo++;
			if(rend[i] == 'C') co++;
		}
		int kesz = 0;
		if(bo*2<b){kesz+=bo; b-=bo*2;}
		else{kesz+=b/2; b-=(b/2)*2;}
		if(co*2<c){kesz+=co; c-=co*2;}
		else{kesz+=c/2; c-=(c/2)*2;}
		if(min(b,c)<vo) kesz+=min(b,c);
		else kesz+= vo;
		sol[i]=kesz;
	}
	for(int i=0; i<n; i++) cout << sol[i] << endl;
}