#!/bin/python3

import sys


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