static String reverse ( String input ) {
  char [ ] a = input . toCharArray ( ) ;
  int l , r = 0 ;
  r = a . length - 1 ;
  for ( l = 0 ;
  l < r ;
  l ++ , r -- ) {
    char temp = a [ l ] ;
    a [ l ] = a [ r ] ;
    a [ r ] = temp ;
  }
  return String . valueOf ( a ) ;
}

static String reverse ( String input ) { char [ ] a = input . toCharArray ( ) ; int l , r = 0 ; r = a . length - 1 ; for ( l = 0 ; l < r ; l ++ , r -- ) { char temp = a [ l ] ; a [ l ] = a [ r ] ; a [ r ] = temp ; } return String . valueOf ( a ) ; }
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