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.
# your code goes here
year = int(input())
while True:
	year+=1
	digits=[0]*10
	is_distinct = True
	for digit in str(year):
		digits[int(digit)]+=1
	for digit_count in digits:
		if digit_count>1:
			is_distinct = False
			break
	if is_distinct:
			print(year)
			break