#include <cstdio>
#include <cstring>
using namespace std;
typedef long long ll;

int main() {
    int T, ans[60], sz, m;
    ll n;    
    scanf("%d", &T);
    while (T--) {
        scanf("%d %I64d", &m, &n);
        sz=0;
        memset(ans, 0, sizeof(ans));
        while (n) {
            ans[sz++]=n%3;
            n/=3;
        }
        for (int i=m-1;i>=0;--i) {
            if (ans[i]==0) printf("R");
            else if (ans[i]==1) printf("G");
            else printf("B");
        }
        printf("\n");
    }
    return 0;
}