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())
a=True
while a:
    y=y+1
    b=str(y)
    if (int(b[0])!=int(b[1])) and (int(b[0]) !=int(b[2])):
        if (int(b[0]) !=int(b[3])) and (int(b[1])!= int(b[2])):
            if (int(b[1]) != int(b[3])) and (int(b[2]) != int(b[3])):
                break
print(y)
