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.
gads = input()
a = True
while a == True :
    gads = int(gads)
    gads+=1
    gads = str(gads)
    for n in range(3) :
        x = gads.rfind(gads[n])
        if n != x :
            break