#!/bin/python3

import sys


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