#include<iostream>
using namespace std;
int main(){
	int n,i,j,t,d,m;
	cin>>n;
	for(i=1;;i++){
		d=n;
		m=0;	
		for(j=1;;j++){
			if(n==0){
				break;
			}
			t=n%10;
			m=m*10+t;
			n=n/10; 
		}
		if(m==d){
			cout<<i-1;
			break;
		}else{
			n=d+m;
		}
	}
} 
/**************************************************************
	Problem: 1083
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/