/*Sherlock and Watson and Adler*/
#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<queue>
#include<stack>
#include<math.h>
#include<vector>
#include<map>
#include<deque>
#include<set>
#include<cmath>
#include<complex>
#include<string>
#include<algorithm>
#include<iostream>
#define exp 1e-10
#define ll long long
using namespace std;
const int N = 30 + 10;
const int M = 10000 + 10;
const int inf = 100000000;
const int mod = 2009;
char s[N];
int main()
{
    int t,m,k,p,i;
    __int64 n;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%I64d",&m,&n);
        p=m;
        for(i=1;i<=m;++i)   s[i]='R';
        while(n)
        {
            k=n%3;
            if(k==0)
                s[p]='R';
            else if(k==1)
                s[p]='G';
            else if(k==2)
                s[p]='B';
            p--;
            n/=3;
        }
        for(i=1;i<=m;i++)
            printf("%c",s[i]);
        puts("");
    }
    return 0;
}