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.
n=int(input())
a=n+1
b=str(a)
d=False
while d==False:
    b=str(b)
    if b[0]!=b[1] and b[0]!=b[1] and b[0]!=b[3] and b[1]!=b[2] and b[1]!=b[3] and b[2]!=b[3]:
        d=True
        print(b)
    else:
        b=int(b)+1
    