#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))

a=sorted(a)
#print(a)
minn=a[0]-a[1]
if minn<0:
    minn=-minn
#print(minn)
h=0
while h<=len(a)-2:
    neww=a[h]-a[h+1]
    if neww<0:
        neww=-neww
    if neww<minn:
        minn=neww
    h=h+1

print(minn)