#!/bin/python3

import sys
from math import *
n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort()
diff=999999999999999
for x in range(len(a)-1):
    if abs(a[x+1]-a[x])<diff:
        diff=abs(a[x+1]-a[x])
print(diff)