#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
minm=10000000000
a=sorted(a)
for i in range(len(a)-1):
    diff=abs(a[i]-a[i+1])
    if minm>diff:
        minm=diff
print(minm)        
    
# your code goes here