public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int n = in . nextInt ( ) , a [ ] = new int [ 101 ] , i , j ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    int r = in . nextInt ( ) ;
    for ( j = 0 ;
    j < r ;
    j ++ ) a [ in . nextInt ( ) ] ++ ;
  }
  for ( i = 0 ;
  i < 101 ;
  i ++ ) {
    System . out . print ( a [ i ] == n ? i + " " : "" ) ;
  }
  in . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int n = in . nextInt ( ) , a [ ] = new int [ 101 ] , i , j ; for ( i = 0 ; i < n ; i ++ ) { int r = in . nextInt ( ) ; for ( j = 0 ; j < r ; j ++ ) a [ in . nextInt ( ) ] ++ ; } for ( i = 0 ; i < 101 ; i ++ ) { System . out . print ( a [ i ] == n ? i + " ▁ " : " " ) ; } in . close ( ) ; }
(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))) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal)))) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier))) (for_statement init: (assignment_expression left: (identifier) right: (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: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (update_expression (array_access array: (identifier) index: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (ternary_expression condition: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) consequence: (binary_expression left: (identifier) right: (string_literal)) alternative: (string_literal))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))