#!/bin/python3

import sys


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

a = sorted(a)
minNum = float('inf')
for i in range(n-1):
    if abs(a[i] - a[i+1]) < minNum:
        minNum = abs(a[i] - a[i+1])
        
print(minNum)