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 different_digits(num):
    for d in str(num):
        if str(num).count(d) > 1:
            return False
    return True

y = int(input())
for i in range(y+1, 2 * y):
      if different_digits(i) == True:
            print(i)
            break