#!/bin/python3

import sys
import itertools

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
#a = list(set(a))
a.sort()
n = len(a)
# your code goes here
diff = abs(a[0] - a[0+1])
for i in range(n-1):
    if diff > abs(a[i+1] - a[i]):
        diff = abs(a[i+1] - a[i])
            
print(diff)