#include<iostream>
using namespace std;
int Reverse(int n) 
{
	int t;
	t=n;
	int s=0;
	while(n)
	{
	s=s*10+n%10;
	n/=10;
	}
	if(s==t)
	{
		return 1;
	}
	else
	return 0;
}
int main()
{
	int m,sum=0,a;
	cin>>m;
	while(Reverse(m)==0)
	{
		 int count=0;
		a=m;
		sum++;
		while(a)
		{
		count=count*10+a%10;
		a/=10;	
		}
		m+=count;
		count=0;
	}
	cout<<sum;
}