#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>
using namespace std;
string tmp;
int T;
void init(){
cin>>T;
}
void solve(){
while(T--){
cin>>tmp;
if(tmp.find("GLB")==string::npos)cout<<"NO"<<endl;
else cout<<"YES"<<endl;
}
}
int main(int argc, char *argv[]) {
init();
solve();
return 0;
}