#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a = sorted(a)
minn = 9999999999
for i in range(n - 1):
    x = abs(a[i] - a[i+1])
    if minn > x:
        minn = x
        if minn == 0:
            break
print (minn)
# your code goes here