118A

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

    string s1,sl;
    cin>>s1;
    transform(s1.begin(), s1.end(), s1.begin(), ::tolower);
    int i,k;
    k=s1.size();
    for(i=0; i<k; i++)
    {
        if(s1[i]!='A'||s1[i]!='a'||s1[i]!='E' ||s1[i]!= 'e' ||s1[i]!= 'I' ||s1[i]!= 'i' ||s1[i]!= 'u'||s1[i]!= 'U' ||s1[i]!= 'o' ||s1[i]!= 'O'||s1[i]!= 'y'||s1[i]!= 'Y')
        {
            cout<<"."<<s1[i];
        }


    }


}