#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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