#!/bin/python3

import sys

if __name__=='__main__':
    n = int(input().strip())
    a = list(map(int, input().strip().split(' ')))
    min = sys.maxsize
    a = sorted(a)
    for i in range(1,n):
        tmp = abs(a[i - 1] - a[i])
        if (tmp < min):
            min = tmp
        if (min == 0):
            print(min)
            sys.exit()
            
    print(min)
    sys.exit()