#!/bin/python3

import sys


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

a = sorted(a)


min = abs(a[0] - a[1])
for i in range(1, n-1):
    diff = abs(a[i] - a[i+1])
    if diff < min:
        min = diff

print(min)