#include <cstdio>
#include <cstring>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <string>
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <list>
#define _CRT_SECURE_NO_WARNINGS
#pragma warning(disable:4996)


char a[] = "RGB";

void dfs(int m, long long n)
{
    if (m <= 0)
        return;
    int r = n % 3;
    dfs(m - 1, n / 3);
    printf("%c", a[r]);
}

int main()
{
    int t;
    int m;
    long long n;
    scanf("%d", &t);
    while (t--)
    {
        scanf("%d%I64d", &m, &n);
        dfs(m, n);
        printf("\n");
        
    }
    return 0;
}