#!/bin/python3

import sys

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a.sort()
diff = 10**10
for s in range(n-1):
    if abs(a[s]-a[s+1])<diff:
        diff = abs(a[s]-a[s+1])
print(diff)