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())

k=1
while(n<9000):
    n+=1
    i=n
    lst=[]
    while(i>0):
        lst.append(i%10)
        i=i//10
    if len(lst)==len(set(lst)):
        print(n)
        break