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.
#write number of year
y = int(input()) 
while True:
   # add 1 to year 
        y += 1 
        #convert the year number to a strin
        year_str = str(y)  
        if len(set(year_str)) == 4:  
           #print year
            print(y) 