It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
count=0
flag=False
n=int(input())
for i in range(n):
	n+=1
	ls=(list(str(n)))
	st=set(ls)
	for i in range(len(ls)-1):
		if len(ls)==len(st):
			flag=True
			break
	if flag:
		print(n)
		break