#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
a.sort()
diff = None
for i in range(0,n-1):
    df = abs(a[i] - a[i+1])
    if diff is None or df < diff:
        diff = df
    if diff == 0:
        break
print diff