s=input()
a=int(s[0])
b=int(s[1])
c=int(s[2])
if(a>=b):
    max=a
else:
    max=b
if(max<=c):
    max=c
if(a>=b):
    min=b
else:
    min=a
if(min>=c):
    min=c
print(max-min)