inputer = int(input())
lister = input().split(" ")
num_lister = [int(i) for i in list(lister)]
num_lister.sort()

min_d =num_lister[1]-num_lister[0]

for inin in range(inputer):
	if inin > 1:
		if min_d > num_lister[inin]-num_lister[inin-1]:
			min_d=num_lister[inin]-num_lister[inin-1]

print(min_d)