public static void main ( String [ ] args ) {
  Scanner stdin = new Scanner ( System . in ) ;
  ArrayList < Character > v = new ArrayList < Character > ( ) ;
  v . add ( 'a' ) ;
  v . add ( 'e' ) ;
  v . add ( 'i' ) ;
  v . add ( 'o' ) ;
  v . add ( 'u' ) ;
  v . add ( 'y' ) ;
  String s = stdin . next ( ) ;
  String ans = "" ;
  s = s . toLowerCase ( ) ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    if ( ! v . contains ( s . charAt ( i ) ) ) {
      ans += "." + s . charAt ( i ) ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner stdin = new Scanner ( System . in ) ; ArrayList < Character > v = new ArrayList < Character > ( ) ; v . add ( ' a ' ) ; v . add ( ' e ' ) ; v . add ( ' i ' ) ; v . add ( ' o ' ) ; v . add ( ' u ' ) ; v . add ( ' y ' ) ; String s = stdin . next ( ) ; String ans = " " ; s = s . toLowerCase ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { if ( ! v . contains ( s . charAt ( i ) ) ) { ans += " . " + s . charAt ( i ) ; } } System . out . println ( ans ) ; }
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