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 d_d(year):
    y_str = str(year)
    return len(set(y_str)) == len(y_str)

def n_y(y):
    y += 1
    while not d_d(y):
        y += 1
    return y
y = int(input())
r = n_y(y)
print(r)
