#!/bin/python3

import sys


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

a.sort()

min_value = a[1]-a[0]
for i in range(n-1):
    if(a[i+1]-a[i] < min_value):
        min_value = a[i+1]-a[i]
print(min_value)