#include <bits/stdc++.h>   using namespace std;   int a[110], b[110];   int main() {     int n;     cin >> n;     for (int i = 1; i <= n; ++i) cin >> a[i];     sort(a + 1, a + 1 + n);     int aa = a[n];     cin >> n;     for (int i = 1; i <= n; ++i) cin >> b[i];     sort(b + 1, b + 1 + n);     int bb = b[n];     cout << aa <<     << bb << endl;   }   