#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a = sorted(a)
min = abs(a[0] - a[1])
for i in range(len(a)-1):
    if abs(a[i] - a[i+1]) < min:
        min = abs(a[i] - a[i+1])
print(min)