#include "transfer.h"
#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n'
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define in(v,x) (v.find(x) != v.end())
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;
std::vector<int> get_attachment(std::vector<int> s) {
int n = s.size();
FOR(i,0,n) s.PB(s[i]);
return s;
}
std::vector<int> retrieve(std::vector<int> d) {
int n = (d.size())/3;
vector<int> a[3];
FOR(i,0,3) {
vector<int> tmp;
a[i] = tmp;
}
int j = 0;
FOR(i,0,3) {
FOR(k,0,n) {
a[i].PB(d[j]);
j++;
}
}
if (a[0] == a[1]) return a[0];
else if (a[0] == a[2]) return a[0];
else return a[1];
}
