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())

flag=1
while True:
    a=a+1
    year=a
    b=set()
    for j in range(0,4):
        d=year%10
        b.add(d)
        year=year//10
    if len(b)==4:
        print(a)
        break