#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a.sort()
minimum = 10**10
for i in range(n-1):
    absdiff = a[i+1] - a[i]
    if absdiff < minimum:
        minimum = absdiff
print(minimum)