#include <iostream>
using namespace std;
int main() {
float a,g,pa,pg,t1,t2;
cin>>a;
cin>>g;
cin>>pa;
cin>>pg;
t1=pa/a;
t2=pg/g;
if(t1>t2){
cout>>"A";
}
else{
cout<<"G";
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgoKdXNpbmcgbmFtZXNwYWNlIHN0ZDsKCmludCBtYWluKCkgewoKZmxvYXQgYSxnLHBhLHBnLHQxLHQyOwoKY2luPj5hOwpjaW4+Pmc7CmNpbj4+cGE7CmNpbj4+cGc7Cgp0MT1wYS9hOwp0Mj1wZy9nOwoKaWYodDE+dDIpewpjb3V0Pj4iQSI7Cgp9CmVsc2V7CmNvdXQ8PCJHIjsKCn0KCQoJcmV0dXJuIDA7Cn0=