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.
prev_year = int(input())
year = prev_year
while True:
	l = []
	year += 1
	for i in str(year):
		l.append(i)
	if len(set(l)) == len(str(year)): 
		break
print(int(year))