using System;

public class Program

{

    public static void Main(string[]args) 

    {

     int num=int.Parse(Console.ReadLine());

  int num1=num%10;

  int num2=(num/10)%10;

  while(num1>num2)

  {

      num/=10;

   num1=num%10;

   num2=(num/10)%10;

  }

   while(num2>num1)

  {

      num/=10;

   num1=num%10;

   num2=(num/10)%10;

  }

  if(num==0||num<=10)

  {

   Console.WriteLine("true");

  }

  else

  {

      Console.WriteLine("false"); 

  }

 }

}