#include <iostream>
#include <iterator>
#include <set>
#include <algorithm>
using namespace std;

int main()
{
    multiset<char>::iterator it;
    multiset<char> a,b,x;
    set<char> x1 = {'A','C','E','F','N'};
    set<char> x2 = {'N','A','H','E'};
    set_union(x1.begin(),x1.end(),x2.begin(),x2.end(),inserter(a,a.begin()));
    set_difference(x1.begin(), x1.end(), x2.begin(), x2.end(),inserter(b, b.begin()));
    set_difference(a.begin(), a.end(), b.begin(), b.end(),inserter(x, x.begin()));
    for (it = x.begin(); it != x.end(); it++)
        cout << *it;
}