#!/bin/python3

import sys


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

a.sort()

m = abs(a[0] - a[-1])
for i in range(len(a) - 1):
    c = abs(a[i] - a[i+1])
    if c < m:
        m = c
    if not m:
        break
        
print(m)