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())  # Input: The year number

while True:
    y += 1  # Increment the year
    year_str = str(y)  # Convert the year to a string
    if len(set(year_str)) == 4:
        # If the year has distinct digits, print it and break out of the loop
        print(y)
        break
