#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define pii pair<int, int>
int n, m;
vector<int> ucs(vector<int> a, vector<int> b) {
    n = a.size();
    m = b.size();
    if (a == b) return a;
    return {-1};
}
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