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 f(stroka):
    for item in stroka:
        if stroka.count(item) != 1:
            # print(item, stroka.count(item))
            return False
    return True
a = int(input())
for i in range(a+1, 9001):
    if f(str(i)) == True:
        print(i)
        break