#!/bin/python3

import sys
import math

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort();
min = 1000
for i in range(0, n - 1):
    if (abs(a[i] - a[i + 1]) < min):
        min = abs(a[i] - a[i + 1])
print(min)