#!/bin/python3

import sys

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort()
# your code goes here
minDiff = a[1]-a[0]
for i in range (2, len(a)):
    minDiff = min(minDiff, a[i]-a[i-1])

print(minDiff)