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.
def main():
    n = int(input())
    while True:
        n = n + 1
        ens = set()
        for k in str(n):
            if k in ens:
                break
            else:
                ens.add(k)
        if len(ens) == 4:
            print(n)
            return
            
        

main()