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.
x=str(int(input())+1)
xlist=[]
while True:
  for c in range(4):
    xlist.append(x[c])
  y=set(xlist)
  if len(y)==4:
    print(x)
    break
  if len(y)!=4:
    x=str(int(x)+1)
    xlist.clear()