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.
year = int(input())+1
def distinct(y):
  n = list(str(y))
  d = True
  for i in range(0, 3):
    for j in range(i+1, 4):
      if n[i] == n[j]:
        d = False
        break
  return d
while not distinct(year):
  year+=1
print(year)