#!/bin/python3

import collections
import math
import sys


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

a.sort()
i = 0
minDif = float("inf")
while i < n - 1:
    if abs(a[i] - a[i+1]) < minDif:
        minDif = abs(a[i] - a[i+1])
    i += 1
   
print(minDif)