public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int answers = sc . nextInt ( ) ;
  int kinds = sc . nextInt ( ) ;
  int [ ] likeCounts = new int [ kinds + 1 ] ;
  Arrays . fill ( likeCounts , 0 ) ;
  for ( int i = 0 ;
  i < answers ;
  i ++ ) {
    int ansCount = sc . nextInt ( ) ;
    for ( int j = 0 ;
    j < ansCount ;
    j ++ ) {
      likeCounts [ sc . nextInt ( ) ] ++ ;
    }
  }
  System . out . println ( IntStream . of ( likeCounts ) . filter ( i -> i == answers ) . count ( ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int answers = sc . nextInt ( ) ; int kinds = sc . nextInt ( ) ; int [ ] likeCounts = new int [ kinds + 1 ] ; Arrays . fill ( likeCounts , 0 ) ; for ( int i = 0 ; i < answers ; i ++ ) { int ansCount = sc . nextInt ( ) ; for ( int j = 0 ; j < ansCount ; j ++ ) { likeCounts [ sc . nextInt ( ) ] ++ ; } } System . out . println ( IntStream . of ( likeCounts ) . filter ( i -> i == answers ) . count ( ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (update_expression (array_access array: (identifier) index: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (binary_expression left: (identifier) right: (identifier))))) name: (identifier) arguments: (argument_list)))))))