public static void main ( String [ ] args ) {
  FastScanner fs = new FastScanner ( ) ;
  int n = fs . nextInt ( ) , m = fs . nextInt ( ) ;
  Node [ ] nodes = new Node [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) nodes [ i ] = new Node ( i ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    nodes [ i ] . outDegree = fs . nextInt ( ) ;
    for ( int j = 0 ;
    j < nodes [ i ] . outDegree ;
    j ++ ) {
      int next = fs . nextInt ( ) - 1 ;
      nodes [ i ] . canReach . add ( nodes [ next ] ) ;
      nodes [ next ] . canReachMe . add ( nodes [ i ] ) ;
    }
  };
}

public static void main ( String [ ] args ) { FastScanner fs = new FastScanner ( ) ; int n = fs . nextInt ( ) , m = fs . nextInt ( ) ; Node [ ] nodes = new Node [ n ] ; for ( int i = 0 ; i < n ; i ++ ) nodes [ i ] = new Node ( i ) ; for ( int i = 0 ; i < n ; i ++ ) { nodes [ i ] . outDegree = fs . nextInt ( ) ; for ( int j = 0 ; j < nodes [ i ] . outDegree ; j ++ ) { int next = fs . nextInt ( ) - 1 ; nodes [ i ] . canReach . add ( nodes [ next ] ) ; nodes [ next ] . canReachMe . add ( nodes [ i ] ) ; } } ; }
(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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (type_identifier) dimensions: (dimensions_expr (identifier))))) (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: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier)))))) (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 (assignment_expression left: (field_access object: (array_access array: (identifier) index: (identifier)) field: (identifier)) right: (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: (field_access object: (array_access array: (identifier) index: (identifier)) field: (identifier))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (expression_statement (method_invocation object: (field_access object: (array_access array: (identifier) index: (identifier)) field: (identifier)) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) (expression_statement (method_invocation object: (field_access object: (array_access array: (identifier) index: (identifier)) field: (identifier)) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))))))))