#! python3

array_len = int(input())
my_list = [int(x) for x in input().split()]


def get_diff(arr):
    arr.sort()
    diff_arr = []
    for i in range(len(arr) - 1):
        diff_arr.append(abs(arr[i] - arr[i+1]))
    print(min(diff_arr))

get_diff(my_list)