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.

def razl(num):
    for i in range(len(num)):
        for j in range(i + 1, len(num)):
            if num[i] == num[j]:
                return False
    return n

def next_god(num):
    while razl(str(int(num) + 1)) == False:
        num = str(int(num) + 1)
    return str(int(num) + 1)

n = input()

print(next_god(n))