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.
w = int(input())
target = w+1
found = False
while not found:
	target_temp = [int(x) for x in str(target)]
	if len(set(target_temp)) == 4:
		found == True
	else:
		target += 1
print(target)
