numere_a_b

#include <iostream>
using namespace std;

int main()
{
    int a,b,c=0,p=1,k;
    cin>>a>>b;
    while(a>0)
        k=(a%10+b%10)/2,a/=10,b/=10,c+=k*p,p*=10;
    cout<<c;
    return 0;
}