/*************************************************************************

> File Name: a.cpp

> Author: dulun

> Mail: dulun@xiyoulinux.org

> Created Time: 2016年04月22日 星期五 19时12分33秒

************************************************************************/

#include<iostream>

#include<stdio.h>

#include<cstring>

#include<cstdlib>

#include<algorithm>

#define LL long long

using namespace std;

const int N = 50086;

LL n;

char a[5900] = {0};

int main()

{

int T;

scanf("%d", &T);

while(T--)

{

memset(a, 0, sizeof(a));

int m;

LL n;

scanf("%d%lld", &m, &n);

int cnt = 0;

while(n)

{

a[cnt++] += n % 3;

n /= 3;

if(cnt >m) break;

}

for(int i = m-1; i >=0; i--)

{

if(a[i] == 0)

printf("R");

if(a[i] == 1)

printf("G");

if(a[i] == 2)

printf("B");

}

printf("\n");

}

return 0;

}