#include<bits/stdc++.h>
using namespace std;
int aa(int n){
	int i=n,j=1,x=0,s=0;
	while(i!=0){
		x*=10;
		x+=i%10;
		i/=10;
	}
	return x;
}
int main()
{
	int i=0,n,x=0,j=0,k=0,a,l=0;
	cin>>n;
	for(i=0;aa(n)!=n;i++){
		n=aa(n)+n;
	}
	cout<<i;
	return 0;
}
/**************************************************************
	Problem: 1083
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/