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())
'''
list_of_digits = [int(digit) for digit in str(y)]
while(y <= 2013):
  for i in list_of_digits:
    print(list_of_digits.count(i))
    if(list_of_digits.count(i) == 1):
      flag = 1
      continue
    else:
      flag = 0
      break
  if(flag == 1):
    print(i)
    break
  else:
    print(y)
    y += 1
'''
while(True):
  y += 1
  if(len(set(str(y))) == 4):
    print(y)
    break