public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int v = sc . nextInt ( ) ;
  Set < Integer > sellers = new TreeSet < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int k = sc . nextInt ( ) ;
    for ( int j = 0 ;
    j < k ;
    j ++ ) {
      int price = sc . nextInt ( ) ;
      if ( price < v ) {
        sellers . add ( i + 1 ) ;
      }
    }
  }
  System . out . println ( sellers . size ( ) ) ;
  Iterator < Integer > it = sellers . iterator ( ) ;
  while ( it . hasNext ( ) ) {
    System . out . print ( it . next ( ) + " " ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int v = sc . nextInt ( ) ; Set < Integer > sellers = new TreeSet < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { int k = sc . nextInt ( ) ; for ( int j = 0 ; j < k ; j ++ ) { int price = sc . nextInt ( ) ; if ( price < v ) { sellers . add ( i + 1 ) ; } } } System . out . println ( sellers . size ( ) ) ; Iterator < Integer > it = sellers . iterator ( ) ; while ( it . hasNext ( ) ) { System . out . print ( it . next ( ) + " ▁ " ) ; } }
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