#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))

s = sorted(a)
diff = s[1] - s[0]

for i in range(len(s) - 1):
    new_diff = s[i + 1] - s[i]
    if new_diff == 0:
        print(0)
        sys.exit()
    else:
        if new_diff < diff:
            diff = new_diff

print(diff)
    
    
# your code goes here