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.
x=str(int(input("")))
t=False
while t != True:
    x=int(x)+1
    x=str(x)
    for i in x:
        if x.count(i)!=1:
            t=False
            break
        else:
            t=True
print(x)

