#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#define LL long long
using namespace std;
LL a[40], n, m, al;
LL d[31];
char co[3] = { 'R', 'G', 'B' };
int main (){
    LL i, j, k, T;
    scanf ( "%I64d", &T );
    d[0] = 1;
    for ( i = 1; i <= 30; i ++ ) d[i] = d[i-1]*3;
    while ( T -- ){
        scanf ( "%I64d%I64d", &m, &n );
        n %= d[m];
        al = 0;
        memset ( a, 0, sizeof (a) );
        while ( n > 0 ){
            a[++al] = n%3;
            n /= 3;
        }
        for ( i = m; i >= 1; i -- ) printf ( "%c", co[a[i]] );
        printf ( "\n" );
    }
    return 0;
}