#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: fuyijun
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/