#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b,c,h;
	cin>>n;
	a=n%10;
	b=n/10%10;
	c=n/100;
	if(b>a){
		swap(b,a);
	}
	if(c>a){
		swap(c,a);
	}
	if(c>b){
		swap(c,b);
	}
	h=a-c;
	cout<<h;
	
} 

/**************************************************************
	Problem: 1667
	User: zhengzihao3
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/