#!/bin/python3

import sys


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

a.sort()

min_diff = 100000 ** 2

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

print(min_diff)