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=raw_input()
i=0
c=int(a)+1
while i!=1:
    d=list(c.__str__())
    d.sort()
    k=0
    for j in range(3):
        if (d[j]!=d[j+1]):
            k+=1
    if k==3:
        print c
        i=1
    else:
        c+=1