#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a = sorted(a)
mn = a[-1] - a[0]
for i in range(n - 1):
    if a[i + 1] - a[i] < mn:
        mn = a[i + 1] - a[i]
print(mn)