string 1

#include<bits/stdc++.h>
using namespace std;
#define ana ios::sync_with_stdio(0);cin.tie(0);cout.tie(0)
bool vow(char c){

    return (c=='a'|| c=='e'||c=='i'|| c=='o'||c=='u'||c=='y');
}
int main()
{
    ana;
    string s;
    cin>>s;
    for_each(s.begin(),s.end(),[] (char &c){
             c=::tolower(c);
             });
    for(auto c : s){
        if(vow(c)==0){
            cout<<"."<<c;
        }
    }
}