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())
i=a+1
l=[]
while True==True:
            for j in range(len(str(i))):
                        if str(i)[j] not  in l:
                                    l.append(str(i)[j])
            if len(l)==len(str(i)):
                        print(i)
                        break
            l=[]
            i=i+1