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())
k=0
for x in range (a+1,9001):
    for i in range (10):
        if str(x).count(str(i))==1:
            k+=1

    if k==4:
        print(x)
        break
    k=0



