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.
# Input the year number
y = int(input())

# Initialize a flag to indicate if the year has distinct digits
distinct = False

# Loop until we find a year with distinct digits
while not distinct:
    # Increment the year by one
    y += 1

    # Convert the year to a string
    s = str(y)

    # Create a set of the digits in the year
    d = set(s)

    # Check if the length of the set is equal to the length of the string
    # If yes, then the year has distinct digits
    if len(d) == len(s):
        distinct = True

# Print the answer
print(y)
