#include"cstdio"
#include"cstring"
#include"cmath"
#include"algorithm"
#include"iostream"
using namespace std;
typedef  long long LL;

int a[35];
int main()
{int t;
cin>>t;
while(t--)
{memset(a,0,sizeof(a));
    long long n,m;
    cin>>m>>n;
    long long  k=0;
    while(n)
    {
        a[k++]=n%3;
        n/=3;
    }

    for(int i=m-1;i>=0;i--)
    {if(a[i]==0)
    cout<<"R";
    else if(a[i]==1)
        cout<<"G";
    else
        cout<<"B";}
    printf("\n");

}

}