#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
using namespace std;
typedef long long LL;
int main(){
    int T;
    scanf("%d", &T);
    while(T--){
        LL n;
        int m, len, a[50];
        cin >> m >> n;
        len = m;
        memset(a, 0, sizeof(a));
        while(n > 0 && len){
            a[--len] = n % 3;
            n /= 3;
        }
        for(int i = 0; i < m; i++){
            switch(a[i]){
                case 0: cout << 'R'; break;
                case 1: cout << 'G'; break;
                case 2: cout << 'B'; break;
            }
        }
        cout << endl;
    }
    return 0;
}