#include <algorithm>
#include <iostream>
#include <cstdio>
#include <math.h>
#include <cstdlib>
#include <cstring>
#include <ctime>
typedef long long ll;
using namespace std;
char al[3]={'R','G','B'};
int main (void)
{
    int t, m, i;
    ll tmp;
    ll n;
    cin>>t;
    while(t--){
        cin>>m>>n;
        for(i=0; i<m; i++){
            tmp = pow(3.0,m-1-i);
            tmp = n/tmp;
            tmp%=3;
            cout<<al[tmp];
        }
        cout<<endl;
    }
    return (0);
}