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.
y = int(input())
while y <= 9000:
    y += 1
    s_y = str(y)
    n = len(s_y)
    y_ = set(s_y)
    n_ = len(y_)

    if n == n_:
        print(y)
        break
 		 	 	   			  				 	  						 	