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 = input()
n = str(int(n)+1)
x = []
while len(x) != 4:
    x = []
    for i in range(len(n)):
        if n[i] not in x:
            x.append(n[i])
    if len(x) == 4:
        exit
    else:
        n = str(int(n)+1)
print(n)
