#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
 int b[35];
 //   freopen("data.txt",r,stdin);
long long T,m;
 long long n;
 cin>>T;
 while(T--)
 {
     memset(b,0,sizeof(b));
     cin>>m>>n;
     for(int i=m-1;i>=0;i--)
     {
         if(n<=0) break;
         b[i]=n%3;
         n/=3;
     }
     for(int i=0;i<m;i++)
     {
         if(b[i]==0) cout<<'R';
         else if(b[i]==1) cout<<'G';
         else cout<<'B';
     }
     cout<<endl;
 }
}