a.cpp

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
template <typename T1, typename T2>
ostream &operator <<(ostream &os, pair<T1, T2> p){os << p.first << " " << p.second; return os;}
template <typename T>
ostream &operator <<(ostream &os, vector<T> &v){for(T i : v)os << i << ", "; return os;}
template <typename T>
ostream &operator <<(ostream &os, set<T> s){for(T i : s) os << i << ", "; return os;}
template <typename T1, typename T2>
ostream &operator <<(ostream &os, map<T1, T2> m){for(pair<T1, T2> i : m) os << i << endl; return os;}

int main(){
    string s; cin >> s;
    for(int i = 0; i < (int)s.length(); i++){
        s[i] = tolower(s[i]);
    }
    string novowel = "";
    for(int i = 0; i < (int)s.length(); i++){
        if(s[i] != 'a' && s[i] != 'e' && s[i] != 'i' && s[i] != 'o' && s[i] != 'u' && s[i] != 'y'){
            novowel += s[i];
        }
    }
    for(int i = 0; i < (int)novowel.length(); i++){
        cout << '.' << novowel[i];
    }cout << endl;
    return 0;
}