#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define in insert
#define lb lower_bound
#define F first
#define S second
#define sz size()
#define all(v) v.begin(),v.end()
#define FOR1(x, n) for(int j = x; j <= n; j ++)
#define FOR(x, n, m, d) for(int x = n; x <= m; x += d)
#define FORR(x, n, m, d) for(int x = n; x >= m; x -= d)
#define nikita ios_base::sync_with_stdio(0), cin.tie(0);
string guess_sequence(int N){
int n,m,k,sum=0,x,y, ans, r, cnt, l, mod = 1e9+7;
string str = "";
string s = "";
ans = 0;
while(ans < N){
s = str;
FOR(i, 0, N-1-s.sz,1)s+='A';
sum = press(s);
if(sum > ans){
FOR(i, 1, sum-ans, 1)str += 'A';
}
ans = str.sz;
if(ans==N)break;
s = str;
FOR(i, 0, N-1-s.sz,1)s+='B';
sum = press(s);
if(sum > ans){
FOR(i, 1, sum-ans, 1)str += 'B';
}
ans = str.sz;
s = str;
if(ans==N)break;
FOR(i, 0, N-1-s.sz,1)s+='X';
sum = press(s);
if(sum > ans){
FOR(i, 1, sum-ans, 1)str += 'X';
}
ans = str.sz;
if(ans==N)break;
s = str;
FOR(i, 0, N-1-s.sz,1)s+='Y';
sum = press(s);
if(sum > ans){
FOR(i, 1, sum-ans, 1)str += 'Y';
}
ans = str.sz;
if(ans==N)break;
s = str;
}
return str;
}
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