#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
// #define int long long
#define rep(i,n) for(int i=0;i<(n);i++)
#define rng(i,l,r) for(int i=(l);i<(r);i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define rrng(i,l,r) for(int i=(r)-1;i>=(l);i--)
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
std::string guess_sequence(int N) {
string ans="";
{
int x=press("AB");
if(x){
if(press("A"))ans="A";
else ans="B";
}else{
if(press("X"))ans="X";
else ans="Y";
}
}
if(N==1)return ans;
string t="ABXY";
t.erase(find(all(t),ans[0]));
rep(i,N-2){
string s=ans+t[0]+ans+t[1]+t[0]+ans+t[1]+t[1]+ans+t[1]+t[2];
int x=press(s);
if(x==i+1)ans+=t[2];
else if(x==i+2)ans+=t[0];
else ans+=t[1];
}
if(press(ans+t[0])==N)return ans+t[0];
else if(press(ans+t[1])==N)return ans+t[1];
else return ans+t[2];
}
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