//In the name of GOD
#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string S, C, P, tmp="ABXY";
string guess_sequence(int n){
if(n==1){
if(press("A")) return "A";
if(press("B")) return "B";
if(press("X")) return "X";
return "Y";
}
if(press("AB")){
if(press("A")) P="A";
else P="B";
}
else if(press("X")) P="X";
else P="Y";
for (char c: tmp)
if(c!=P[0]) C+=c;
while(P.size()+1<n){
int cnt=press(P+C[0]+C[0]+P+C[0]+C[1]+P+C[0]+C[2]+P+C[1]);
P+=(cnt==P.size()+2 ? C[0] : (cnt==P.size()+1 ? C[1] : C[2]));
}
if(press(P+C[0])==n) P+=C[0];
else if(press(P+C[1])==n) P+=C[1];
else P+=C[2];
return P;
}
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