#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split()))
a.sort()

minDiff = 2000000000
for i in range(n - 1):
        diff = abs(a[i + 1] - a[i])
        if diff < minDiff:
            minDiff = diff

print(minDiff)