#include<stdio.h>

void main(){
    int n,t,x,c=0;
    scanf("%d",&n);

    while(1==1){
        t=n;
        x=0;
        while(t!=0){
            x=x*10+t%10;
            t=t/10;
        }
        if(n==x){
            break;
        }else{
            n=n+x;
            c++;
        }
    }
    printf("%d",c);
}
/**************************************************************
	Problem: 1083
	User: admin
	Language: C
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/