#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a = sorted(a)
m = abs(a[-1])
for x in range(0,n-1):
    t = abs(a[x]-a[x+1])
    if t < m:
        m = t
print(m)