func_code_string: #include <bits/stdc++.h>   using namespace std;   long long GCD(long long a, long long b) {     if (b) return GCD(b, a % b);     return a;   }   bool u1[10];   bool u2[10];   int main() {     long long n, m, v;     vector<long long> a, b;     ios_base::sync_with_stdio(0);     cin >> n >> m;     for (long long i = 0; i < n; i++) {       cin >> v;       a.push_back(v);       u1[v] = true;     }     for (long long i = 0; i < m; i++) {       cin >> v;       b.push_back(v);       u2[v] = true;     }     sort(a.begin(), a.end());     sort(b.begin(), b.end());     for (long long i = 1; i <= 9; i++) {       if (u1[i] && u2[i]) {         cout << i;         return 0;       }     }     if (a[0] < b[0]) {       cout << a[0] << b[0];     } else       cout << b[0] << a[0];   }   