x,y,z=map(int,input())
if x<y and y<z:
    print(z-x)
elif y<x and x<z:
    print(z-y)
elif z<x and x<y:
    print(y-z)
elif x<z and z<y:
   print (y-x)
elif y<z and z<x:
    print(x-y)
else:
    print(x-z)