public static void main ( String [ ] args ) throws Exception {
  BufferedReader input = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String word = input . readLine ( ) ;
  int largest = 0 ;
  for ( int i = word . length ( ) - 1 ;
  i > 1 ;
  i -- ) {
    if ( i % 2 == 0 ) {
      int midle = i / 2 ;
      boolean state = true ;
      for ( int j = 0 ;
      j < i / 2 ;
      j ++ , midle ++ ) {
        if ( word . charAt ( j ) != word . charAt ( midle ) ) {
          state = false ;
          break ;
        }
      }
      if ( state ) largest = Math . max ( largest , i ) ;
    }
  }
  System . out . println ( largest ) ;
}

public static void main ( String [ ] args ) throws Exception { BufferedReader input = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String word = input . readLine ( ) ; int largest = 0 ; for ( int i = word . length ( ) - 1 ; i > 1 ; i -- ) { if ( i % 2 == 0 ) { int midle = i / 2 ; boolean state = true ; for ( int j = 0 ; j < i / 2 ; j ++ , midle ++ ) { if ( word . charAt ( j ) != word . charAt ( midle ) ) { state = false ; break ; } } if ( state ) largest = Math . max ( largest , i ) ; } } System . out . println ( largest ) ; }
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