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.
def year(a):
	a = int(a)
	while True:
		a += 1
		b = str(a)
		if b[0] != b[1] and b[0] != b[2] and b[0] != b[3] and b[1] != b[2] and b[1] != b[3] and b[2] != b[3]:
			return a
		else:
			continue
print(year(input()))
			  	 	   				   									 	 	