#!/bin/python

import sys
from math import *

n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
minDiff = 2000000000
for i in range(1,len(a)):
    curDiff = abs(a[i]-a[i-1])
    if minDiff > curDiff:
        minDiff = curDiff
print minDiff