def maxmas(massive):
_max = massive[0]
for number in massive:
if number > _max:
_max = number
return _max
def minmas(massive):
_min= massive[0]
for number in massive:
if number< _min:
_min= number
return _min
x = [int(input()) for i in range(10)]
maximum = 0
for i in x:
if i > maximum:
maximum = i
minimum = maximum
for i in x:
if i < minimum:
minimum = i
print(maximum - minimum)