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.
n = int(input())

done = False
while not done:
	n += 1
	passed = True

	for i in str(n):
		if str(n).count(i) > 1:
			passed = False
			break
	if passed:
		done = True
		print(n)