#!/bin/python3

import sys


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

# need to make this faster, so sort the array, then take difs between adjacent elems, loglin time
a.sort()

min_diff = a[1] - a[0]

for i in range(len(a)-1):
    diff = a[i+1] - a[i]
    if diff < min_diff:
        min_diff = diff
        
print(min_diff)