#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort()

min_dist = abs(a[0]-a[1])
for i in range(len(a)-1):
    dist = abs(a[i]-a[i+1])
    if dist < min_dist:
        min_dist = dist

print(min_dist)