import sys,math,string
from collections import deque
import collections
def I(): return int(input())
def MI(): return map(int,input().split())
def LI(): return list(map(int,input().split()))
def TI(): return tuple(map(int,input().split()))
def S(): return input()
def LS(): return list(input().split())
def TS(): return tuple(input().split())
def lcm(a, b): return a * b // math.gcd(a, b)
MOD1 = 10**9+7 #500000004
MOD2 = 998244353 #499122177
sys.setrecursionlimit(10**9)

n = list(map(int,list(S())))
n.sort()
print(n[2]-n[0])