#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define lli long long int
std::string guess_sequence(int N) {
vector<string>c;
lli n=press("AB");
if(n==0){
n=press("X");
if(n==0){
c={"Y","A","B","X"};
}
else{
c={"X","A","B","Y"};
}
}
else{
n=press("A");
if(n==0){
c={"B","A","Y","X"};
}
else{
c={"A","X","B","Y"};
}
}
string s=c[0];
if(N==1)return s;
for(lli i=1;i<N-1;i++){
string t=s+c[1]+s+c[2]+c[1]+s+c[2]+c[2]+s+c[2]+c[3];
n=press(t);
if(n==i){
s+=c[3];
}
else if(n==i+1){
s+=c[1];
}
else{
s+=c[2];
}
}
if(press(s+c[1])==N){
s+=c[1];
}
else if(press(s+c[2])==N){
s+=c[2];
}
else{
s+=c[3];
}
return s;
}
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