#include <bits/stdc++.h>   using namespace std;   int main() {     int n1, n2, k, a;     cin >> n1 >> n2;     vector<int> arr1, arr2;     for (int l = 0; l < n1; l++) {       cin >> a;       arr1.push_back(a);     }     for (int l = 0; l < n2; l++) {       cin >> a;       arr2.push_back(a);     }     sort(arr1.begin(), arr1.end());     sort(arr2.begin(), arr2.end());     for (int k = 0; k < arr1.size(); k++) {       for (int l = 0; l < arr2.size(); l++) {         if (arr1[k] == arr2[l]) {           cout << arr1[k] <<   n ;           return 0;         }       }     }     if (arr1[0] < arr2[0]) {       k = 10 * arr1[0] + arr2[0];       cout << k <<   n ;     } else {       k = 10 * arr2[0] + arr1[0];       cout << k <<   n ;     }     return 0;   }   