#!/bin/python3

import sys


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

minrange = None
aa = sorted(a)
for i in range(len(aa)-1):
    if minrange == 0:
        break
    crange = abs(aa[i] - aa[i+1])
    if minrange is None or minrange > crange:
        minrange = crange
            
print(minrange)