#!/bin/python3

import sys

def minabs(a):
	a.sort()
	min_abs = abs(a[0] - a[1])
	for i in range(0, len(a) - 1, 1):
		new_abs = abs(a[i] - a[i+1])
		if( min_abs > new_abs):
			min_abs = new_abs
		if(min_abs == 0): break
	
	print(min_abs)


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

minabs(a)