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.
n = int(input())

if 1000 <= n <= 9000:
    while True:
        flag2 = True
        n += 1
        x = str(n)
        for i in range(len(x)):
            for k in range(i+1,len(x)):
                if x[i] == x[k]:
                    flag2 = False
                    break
            if flag2 is False:
                break
        if flag2:
            break
    print(n)
		  			 			   					 				  	  		