#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <string>

using namespace std;

string ex = "AOYEUIaoyeui";

int main() {
    string s;
    cin >> s;

    for (int i = 0; i < s.size(); i++) {
        bool pr = true;

        for (int j = 0; j < ex.size(); j++) {
            if (s[i] == ex[j]) {
                pr = false;
            }
        }

        if (pr) {
            cout << ".";
            if (s[i] >= 'A' && s[i] <= 'Z')
                s[i] += 'a' - 'A';
            cout << s[i];
        }
    }

    return 0;
}