using System;
public class Program
{
public static void Main()
int [] arr= new int [11];
bool check = true;
for(int i=0;i<11;i++)
arr[i]=int.Parse(Console.ReadLine());
}
for(int i=1;i<11 && check;i++)
check= (arr[i]==arr[i-1]) ? false:check;
Console.WriteLine((check==true) ? "true":"false");