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.
a=int(input(""))
a+=1

y=True
while y==True:
      l1=[]
      z=str(a)
      x=list(z)
      for i in range(len(x)):
           if x[i] not in l1:
                l1.append(x[i])
           if len(l1)==4:
                print("".join(l1))
                y=False
                break
      a+=1 