package srange_lottery;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.math.BigInteger;

import java.util.Scanner;

public class SrangeLottery {

public static void main(String[] args) throws IOException {

Scanner sc = new Scanner(new FileReader("input.txt"));

String number = sc.nextLine();

char[] ch = number.toCharArray();

BigInteger min = new BigInteger("0");

for(int i = 1; i < ch.length; i++){

if(i + 1 <= number.length()){

String strOne = number.substring(0, i) + number.substring(i+1);

if(!strOne.substring(0,1).equals("0")){

for(int j = 0; j < strOne.length(); j++){

String strTwo = (strOne.substring(0, j) + strOne.substring(j+1));

if(!strTwo.substring(0,1).equals("0")){

BigInteger str = new BigInteger(strTwo);

if(min.compareTo(str) < 0){

min = str;

}

}

}

}

}

}

FileWriter out = new FileWriter("output.txt");

out.write(String.valueOf(min));

out.close();

}

}