#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
min = sys.maxsize
a.sort(reverse=False)
for i in range(0,n-1):
	x=abs(a[i]-a[i+1])
	if(x < min):
		min = x
print(min)