#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here

a.sort()

result = a[-1]-a[0]
for i in range(len(a)-1):
    tmp = abs(a[i+1]-a[i])
    if tmp < result:
        result = tmp
print(result)