#include<stdio.h>
int max(int a, int b)
{
	if (a > b)
		return a;
	else
		return b;
}
int min(int a, int b)
{
	if (a < b)
		return a;
	else
		return b;
}
int main()
{
	int n;
	scanf("%d", &n);
	int a, b, c;
	a = n / 100;
	b = n / 10 % 10;
	c = n % 10;
	printf("%d\n", max(a, max(b, c)) - min(a, min(b, c)));
	return 0;
}