static void division_of_string ( char [ ] str , int k ) {
  int n = str . length ;
  Map < Character , Boolean > has = new HashMap < > ( ) ;
  int ans = 0 , cnt = 0 , i = 0 ;
  while ( i < n ) {
    if ( ! has . containsKey ( str [ i ] ) ) {
      cnt ++ ;
      has . put ( str [ i ] , true ) ;
    }
    if ( cnt == k ) {
      ans = i ;
      break ;
    }
    i ++ ;
  }
  has . clear ( ) ;
  cnt = 0 ;
  while ( i < n ) {
    if ( ! has . containsKey ( str [ i ] ) ) {
      cnt ++ ;
      has . put ( str [ i ] , true ) ;
    }
    if ( cnt == k ) {
      break ;
    }
    i ++ ;
  }
  if ( cnt < k ) {
    System . out . println ( "Not possible" ) ;
  }
  else {
    i = 0 ;
    while ( i <= ans ) {
      System . out . print ( str [ i ] ) ;
      i ++ ;
    }
    System . out . println ( "" ) ;
    while ( i < n ) {
      System . out . print ( str [ i ] ) ;
      i ++ ;
    }
    System . out . println ( "" ) ;
  }
  System . out . println ( "" ) ;
}

static void division_of_string ( char [ ] str , int k ) { int n = str . length ; Map < Character , Boolean > has = new HashMap < > ( ) ; int ans = 0 , cnt = 0 , i = 0 ; while ( i < n ) { if ( ! has . containsKey ( str [ i ] ) ) { cnt ++ ; has . put ( str [ i ] , true ) ; } if ( cnt == k ) { ans = i ; break ; } i ++ ; } has . clear ( ) ; cnt = 0 ; while ( i < n ) { if ( ! has . containsKey ( str [ i ] ) ) { cnt ++ ; has . put ( str [ i ] , true ) ; } if ( cnt == k ) { break ; } i ++ ; } if ( cnt < k ) { System . out . println ( " Not ▁ possible " ) ; } else { i = 0 ; while ( i <= ans ) { System . out . print ( str [ i ] ) ; i ++ ; } System . out . println ( " " ) ; while ( i < n ) { System . out . print ( str [ i ] ) ; i ++ ; } System . out . println ( " " ) ; } System . out . println ( " " ) ; }
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