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=input()
while True:
 lst=[]
 n=int(n)+1
 for a in str(n):
    lst.append(a)
 if len(lst)==len(set(lst)):
    print("".join(lst))
    break
 else:
    continue    