#!/bin/python3

import sys


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

a = sorted(a)
min_dif = abs(a[0]-a[1])
for i in range(0,len(a)-1):
    min_dif = min(abs(a[i]-a[i+1]), min_dif)
print(min_dif)