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.
#In the name of GOD
def is_distinct(number):
	number = str(number)
	check = False
	l = []
	for item in number:
		if item in l: 
			check = True
			break
		l.append(item)
	return check
		

i = int(input()) + 1

while is_distinct(i):
	i += 1
print(i)
