#!/bin/python3

import sys


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

f = abs(l[0]-l[1])
l = sorted(l)
for i in range(len(l)-1):
    if abs(l[i]-l[i+1]) < f:
        f = abs(l[i]-l[i+1])

print(f)