#!/bin/python3

import sys


n = int(input().strip())
a = [(int(temp)) for temp in input().strip().split(' ')]
# your code goes here

a.sort()
mindiff = 1000000000

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