#include <cstdio>
#include <string>
#include <cstring>
using namespace std;

const char A[3] = {'R', 'G', 'B'};
int main()
{
    int t, m, size;
    int buf[35];
    unsigned long long n;
    
    scanf("%d", &t);
    while(t--)
    {
        scanf("%d %I64u", &m, &n);
        memset(buf, 0, sizeof(buf));
        size = 0;
        while(n)
        {
            buf[size++] = n % 3;
            n /= 3;                
        }
        for(int i = m - 1; i >= 0; i--)
            printf("%c", A[buf[i]]);
        printf("\n");
    }
    
    return 0;
}