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())
# convert year to string and count distinct digits
year_str = str(y)
distinct_digits = len(set(year_str))
# loop through all possible year numbers
for i in range(y+1, 9001):
    # convert year to string and count distinct digits
    new_year_str = str(i)
    new_distinct_digits = len(set(new_year_str))
    # if the number of distinct digits is smaller, update the answer
    if new_distinct_digits < distinct_digits:
        distinct_digits = new_distinct_digits
        y = i
print(y)
