#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a.sort()
mindiff = abs(a[0] - a[1])
for i in range(len(a) - 1):
    diff = abs(a[i] - a[i + 1])
    if diff < mindiff:
        mindiff = diff
print(mindiff)