#include <bits/stdc++.h>

using namespace std;


int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    string s, result = "";

    getline(cin, s);
    for(char& c : s){
        if(c >= 'A' && c <= 'Z'){
            c += 32;
        }
        if(c == 'a' || c == 'e' || c == 'o' || c == 'i' || c == 'u' || c == 'y'){
            continue;
        } else{
            result += ".";
            result += c;
        }
    }

    cout << result;

    cout << flush;

    return 0;
}