#include<iostream>
#include<cstring>
using namespace std;
int arr[31];
int main()
{
    int T;cin >> T;
    while(T --)
    {
        int m;long long n;
        memset(arr,0,sizeof(arr));
        cin >> m >> n;
        for(int i = m;i >= 1 && n > 0;i --)
            arr[i] = n % 3,n = n / 3;
        for(int i = 1;i <= m;i ++)
        {
            if(arr[i] == 0)
                cout << "R";
            else if(arr[i] == 1)
                cout << "G";
            else
                cout << "B";
        }
        cout << endl;
    }
    return 0;
}