#include <iostream>
#include <string>
using namespace std;
int main()
{
    string s;
    cin >> s;

    for(int i = s.size() - 1; i >= 0; -- i)
    {
        if(s[i] == 'a' || s[i] == 'e' || s[i] == 'i'|| s[i] == 'o'|| s[i] == 'u')
        {
            cout << s[i];
            return 0;
        }
    }
    return 0;
}