#include<stdio.h>

long long hw(long long x)//自定义反转函数
{
	long long y = 0;
	while(x > 0)
	{
		y *= 10;
		y += x % 10;
		x /= 10;
	}
	return y;
}

int main()
{
	long long x;
	scanf("%lld", &x);
	long long ct = 0, y = hw(x);
	while(x != y)
	{
		ct++;
		x += y;
		y = hw(x);
	}
	printf("%lld", ct);
	return 0;
}