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())
    for a in range(a+1,9000):
        b=a
        c=a%10
        a=a/10
        d=a%10
        a=a/10
        e=a%10
        a=a/10
        f=a%10
        if(c!=d and e!=d and f!=d and c!=f and c!=e and f!=e ):
            print(b)
            break
        