118A

#include<bits/stdc++.h>
using namespace std;
int main()
{

    string s;
    cin>>s;
    transform(s.begin(), s.end(), s.begin(), ::tolower);
    int i,k;
    k=s.size();
    for(i=0; i<k; i++)
    {
        /*if(s[i]!='a' ||s[i]!= 'e'  ||s[i]!= 'i' ||s[i]!= 'u'||s[i]!= 'o' ||s[i]!= 'y')
        {
            cout<<"."<<s[i];
        }*/

        if(s[i]=='o' or s[i]=='a' or s[i]=='e' or s[i]=='i' or s[i]=='u')
            cout<<"";
        else
            cout<<"."<<s[i];


    }


}