public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String [ ] data = sc . nextLine ( ) . split ( " " ) ;
  int N = Integer . parseInt ( data [ 0 ] ) ;
  int M = Integer . parseInt ( data [ 1 ] ) ;
  int [ ] food = new int [ M ] ;
  for ( int i = 0 ;
  i < M ;
  i ++ ) {
    food [ i ] = 0 ;
  }
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    data = sc . nextLine ( ) . split ( " " ) ;
    int K = Integer . parseInt ( data [ 0 ] ) ;
    for ( int j = 1 ;
    j <= K ;
    j ++ ) {
      int value = Integer . parseInt ( data [ j ] ) ;
      food [ -- value ] ++ ;
    }
  }
  int cnt = 0 ;
  for ( int i = 0 ;
  i < M ;
  i ++ ) {
    if ( food [ i ] == N ) cnt ++ ;
  }
  System . out . println ( cnt ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String [ ] data = sc . nextLine ( ) . split ( " ▁ " ) ; int N = Integer . parseInt ( data [ 0 ] ) ; int M = Integer . parseInt ( data [ 1 ] ) ; int [ ] food = new int [ M ] ; for ( int i = 0 ; i < M ; i ++ ) { food [ i ] = 0 ; } for ( int i = 0 ; i < N ; i ++ ) { data = sc . nextLine ( ) . split ( " ▁ " ) ; int K = Integer . parseInt ( data [ 0 ] ) ; for ( int j = 1 ; j <= K ; j ++ ) { int value = Integer . parseInt ( data [ j ] ) ; food [ -- value ] ++ ; } } int cnt = 0 ; for ( int i = 0 ; i < M ; i ++ ) { if ( food [ i ] == N ) cnt ++ ; } System . out . println ( cnt ) ; }
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