#include <iostream>
#include <cctype>
#include <string>
using namespace std;

int main()
{
	string str;
	cin>>str;
	int length;
	length=str.size();
	for(int i=0; i<length; ++i)
	{
		str[i]=tolower(str[i]);
		if((str[i]!='a')&&(str[i]!='e')&&(str[i]!='i')&&(str[i]!='o')&&(str[i]!='u')&&(str[i]!='y'))
			cout<<'.'<<str[i];
	}
	cout<<endl;
	return 0;
}