#!/bin/python

import sys


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

a.sort()
minabs = 10e19


first = a[0]
for x in a[1:]:
    nv = abs(first - x)
    if minabs > nv:
        minabs = nv
    first = x

print minabs