#include<cstdio>
#include<cstring >
#include<cstdlib>
#include<cmath>
#include<iostream>

using namespace std;

int M;
unsigned long long N;
int P[10001];

int main()
{
    int T;
    cin>>T;
    while(T--)
    {
        cin>>M;
        //M=10;
        cin>>N;
    
        
        memset(P,0,sizeof(P));
        
        int x=0;
        while(N>0)
        {
            P[++x]=N%3;
            N/=3;
        }
        
        int L=0;
     
        for(int i=M; i>=1; i--)
        {
        
                 if(P[i]==0)cout<<"R";
              if(P[i]==1)cout<<"G";
              if(P[i]==2)cout<<"B";
              L++;
          }
           cout<<endl;
       }
    
    return 0;
}