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=input()
year=x
b=0
year=int(year)	
while x[0]==x[1] or x[0]==x[2] or x[0]==x[3] or x[1]==x[2] or x[1]==x[3] or x[2]==x[3]:
 year=year+1
 x=str(year)
 b+=1	
if b>0:print(year)
else:print(year+1)