#!/bin/python3

import sys


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

a.sort()
difference = abs(a[1] - a[0])
for i in range(0,len(a)):
    if i + 1 < len(a):
        if abs(a[i+1] - a[i]) < difference:
        
            difference = abs(a[i+1] - a[i])
print(difference)