#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cstdlib>
#include <queue>
#include <stack>
#include <cmath>
#include <vector>
#include <map>
#define lson l , m , rt << 1
#define rson m + 1 , r , rt << 1 | 1
#define ll long long
#define ull unsigned long long

using namespace std;

const int inf = 0x3f3f3f3f;
const int M = 10002;

int a[40];

int main(){

   // freopen("input.txt", "r", stdin);

    int t;
    scanf("%d", &t);
    while(t--){
        long long m, n;
        scanf("%lld%lld", &m, &n);
        for(int i = m; i >= 1; i--){
            a[i] = n%3;
            n = n/3;
        }
        for(int i = 1; i <= m; i++){
            if(a[i] == 0){
                printf("R");
            }
            else if(a[i] == 1)
                printf("G");
            else if(a[i] == 2)
                printf("B");
        }
        printf("\n");
    }


    return 0;
}