#include<bits/stdc++.h>
using namespace std;
int ss(int n){
	int a=n,s=0;
	while(a){
		s=s*10+a%10;
		a/=10;
	}
	return s;
}
int main()
{
	int n,i=0,j;
	cin>>n;
	while(ss(n)!=n){
		n+=ss(n);
		i++;
	}
	cout<<i;
	return 0;
}

/**************************************************************
	Problem: 1083
	User: zzz
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/