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())
x=n+1
if 1000<=x<=9000:
   while x>n:
     m=[]
     s=list(str(x))
     for i in s:
        if i not in m:
           m.append(i)
     if len(m)==len(s):
        print(x)
        break
     else:
        x+=1
