#!/bin/python3

import sys


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

a.sort()
min = a[len(a)-1] - a[0]

for i in range(len(a) - 1):
    dif = abs(a[i] - a[i+1])
    if dif < min:
        min = dif

print(min)