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())
def digits(year):
     d=set()
     for digit in str(year):
          if digit in d:
               return False
               d.add(digit)
          return True
     
n=y+1
while not digits(n):
     n+=1
print(n)