func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long n, i, a;     unsigned long long s1 = 0, s2 = 0, s3 = 0;     cin >> n;     for (i = 0; i < n; i++) {       cin >> a;       s1 += (unsigned long long)a;     }     for (i = 0; i < n - 1; i++) {       cin >> a;       s2 += (unsigned long long)a;     }     for (i = 0; i < n - 2; i++) {       cin >> a;       s3 += (unsigned long long)a;     }     cout << s1 - s2 <<   n  << s2 - s3;     return 0;   }   