#!/bin/python3

import sys
import itertools 

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

# your code goes here

tuples = []
first = 0
second = 1

for element in range (0, len(a)-1):
    tup = (a[first], a[second])
    tuples.append(tup)
    first += 1
    second +=1

differences = []

for t in tuples:
    difference = t[1] - t[0]
    differences.append(difference)
    
print(min(differences))