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()
while True :
    gads = int(gads)
    gads+=1
    gads = str(gads)
    if gads[0] != gads[1] and gads[0] != gads[2] and gads[0] != gads[3] and gads[1] != gads[2] and gads[1] != gads[3] and gads[2] != gads[3] :
        print(gads)
        break
        