#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
l = len(a)
mi = None
for i in xrange(l-1):
    diff = abs(a[i] - a[i + 1])
    if mi is None:
        mi = diff
        continue
    if diff < mi:
        mi = diff
print mi