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