#!/bin/python3

import sys


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