#!/bin/python3

import sys

def min_abs_dist(vec):
    # sort a list
    vec.sort()
    prev = vec[0]
    min_dist = float('inf')
    for cur in vec[1:]:
        dist = abs(cur - prev)
        if dist < min_dist:
            min_dist = dist
        prev = cur
    return min_dist

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
min_dist = min_abs_dist(a)
print(min_dist)