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 isDistinct(a):
	myDict = {}
	for char in str(a):
		if char in myDict:
			return False
		myDict[char] = 0
	return True

year = int(input()) + 1

while not isDistinct(year):
	year = year + 1

print(year)


