#include <iostream>
using namespace std;
int main() {
string s;
cin>>s;
string capalpha="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string vowels="aoyeui";
int a=0;
for(int j=1;j<=26;j++){
for(int i=0;i<=s.size()-1;i++){
if(s[i]==capalpha[a]){s[i]+=32;}}
a++;
}
a=0;
int c=0;
for(int j=1;j<=26;j++){
for(int i=0;i<=vowels.size()-1;i++){
if(s[i]==vowels[a]){s[i]=0;
c++;
}}
a++;
}
a=0;
for(int j=0;j<s.size();j++){
if(s[j]!=0){cout<<"."<<s[j];}
}
return 0;
}
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