// No.2314 Backflip
package main

import (
	"fmt"
	"strings"
)

func main() {
	var s string
	fmt.Scan(&s)

	if strings.HasSuffix(s, "0") {
		fmt.Println(s[0:len(s)-1] + "1")
	} else {
		fmt.Println(s[0:len(s)-1] + "0")
	}
}