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.
#initializes current year and the next year
year = int(input())
newYear = year

#checks for the next year with 4 distinct digits
while True:
  digits = []
  newYear += 1
  for digit in str(newYear):
    digits.append(digit)
  if len(set(digits)) == 4:
    break

#prints next eyar with distinct digits
print(newYear)