#!/bin/python3
import math
import sys


n = int(input().strip())
types = list(map(int, input().strip().split(' ')))
out=sys.maxsize
types.sort()
for i in range(0,n-1):
    a= math.fabs(types[i]-types[i+1])
    if a<out:
        out=a
print(int(out))