func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = (int)1e6 + 5;   const int MACX = (int)1e9 + 7;   const int dx[] = {1, -1, 0, 0};   const int dy[] = {0, 0, 1, -1};   long long n, a[N], b[N], c[N];   multiset<long long> ms, ms2;   int main() {     ios_base ::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     cin >> n;     for (int i = 1; i <= n; i++) {       cin >> a[i];       ms.insert(a[i]);     }     for (int i = 1; i < n; i++) {       cin >> b[i];       ms.erase(ms.find(b[i]));       ms2.insert(b[i]);     }     for (int i = 1; i < n - 1; i++) {       cin >> c[i];       ms2.erase(ms2.find(c[i]));     }     cout << *ms.begin() <<     << *ms2.begin();     return 0;   }   