#!/bin/python3

import sys


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

z = sorted(a)
pairs = [z[i: i+2] for i in range(len(z)-1)]
pairs
difs = [abs(a-b) for (a,b) in pairs]
print(min(difs))