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.
### s = [int(x) for x in input().split(" ")]

def func(x: int):
    while True:
        x += 1
        s = str(x)
        for i in s:
            if s.count(i) > 1:
                break
            if i == s[-1]:
                return x
        
    

print(func(int(input())))