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.
y=int(input ())
for i in range (y+1,9013):
    w=""
    w=str(i)
    s=""
    for l in w:
        if l not in s:
            s+=l
    if len(s)==4:
        print (int(s))   
        break    