#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
bool used[12312];
void solve(int n)
{
std::random_device rd;
std::mt19937 gen(rd());
memset(used,0,sizeof(used));
int br=0,l=0;
while(1)
{
std::uniform_int_distribution<> d(1, n);
int ans=d(gen);
ans=kth(ans);
if(cnt(ans)>n/3)
{
say_answer(ans);
l=1;
break;
}
}
if(l==0)
say_answer(-1);
}
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