#include<map>
#include<queue>
#include<cmath>
#include<cstdio>
#include<stack>
#include<iostream>
#include<cstring>
#include<algorithm>
#define ll long long
#define LL unsigned __int64
#define inf 0x3f3f3f3f
#define eps 1e-8
#include<vector>
#define ls l,mid,rt<<1
#define rs mid+1,r,rt<<1|1
using namespace std;
int arr[1000000];
char str[3]={'R','G','B'};
int main(){
    int i,j,k,cla,m;
    LL n;
    scanf("%d",&cla);
    while(cla--){
        memset(arr,0,sizeof(arr));
        k = 0;
        scanf("%d %I64d",&m,&n);
        while(n){
            arr[k++]=n%3;
            n /= 3;
        }
        for(i = m-1;i >= 0;-- i){
            printf("%c",str[arr[i]]);
        }
        puts("");
    }
    return 0;
}