#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a=sorted(a,reverse=True)
if n>=2:
    mino=a[0]-a[1]
else:
    print(a)
for i in range(len(a)-1):
    mino=min(mino,a[i]-a[i+1])
print(mino)