public static void main ( String [ ] args ) throws FileNotFoundException {
  Scanner in = new Scanner ( new File ( "input.txt" ) ) ;
  int res = in . nextInt ( ) ;
  in . nextLine ( ) ;
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) {
    int a = in . nextInt ( ) ;
    int b = in . nextInt ( ) ;
    in . nextLine ( ) ;
    if ( a == res ) {
      res = b ;
    }
    else if ( b == res ) {
      res = a ;
    }
  }
  System . out . println ( res ) ;
  try {
    FileWriter myWriter = new FileWriter ( "output.txt" ) ;
    myWriter . write ( String . valueOf ( res ) ) ;
    myWriter . close ( ) ;
  }
  catch ( IOException e ) {
    System . out . println ( "An error occurred." ) ;
    e . printStackTrace ( ) ;
  }
}

public static void main ( String [ ] args ) throws FileNotFoundException { Scanner in = new Scanner ( new File ( " input . txt " ) ) ; int res = in . nextInt ( ) ; in . nextLine ( ) ; for ( int i = 0 ; i < 3 ; i ++ ) { int a = in . nextInt ( ) ; int b = in . nextInt ( ) ; in . nextLine ( ) ; if ( a == res ) { res = b ; } else if ( b == res ) { res = a ; } } System . out . println ( res ) ; try { FileWriter myWriter = new FileWriter ( " output . txt " ) ; myWriter . write ( String . valueOf ( res ) ) ; myWriter . close ( ) ; } catch ( IOException e ) { System . out . println ( " An ▁ error ▁ occurred . " ) ; e . printStackTrace ( ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (string_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (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: (decimal_integer_literal)) 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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (try_statement body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (string_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (catch_clause (catch_formal_parameter (catch_type (type_identifier)) name: (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))))