#!/bin/python3

import sys


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

a.sort()
min_diff = a[n-1] - a[0]
for i in range(1,n):
    min_diff = min(a[i] - a[i-1],min_diff)
    
print(min_diff)