#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort()
min_diff = 2 * 10**9
end_index = n-1
for index,num in enumerate(a):
    if index < end_index:
        min_diff = min(min_diff, abs(num - a[index+1]))
        if min_diff == 0:
            break
print(min_diff)