#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
max1 = a[0]
for i in range(n):
    max1 = max(max1, a[i])

a.remove(max1)
max2 = a[0]
for i in range(n-1):
    max2 = max(max2, a[i])

print(abs(max1-max2))