#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
char s[35],str[]="RGB";
int t,m;
long long n;
int main()
{
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%I64d",&m,&n);
        for(int i=m-1;i>=0;i--)
        {
            s[i]=str[n%3];
            n/=3;
        }
        s[m]='\0';
        printf("%s\n",s);
    }
    return 0;
}