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.
original =int(input())
nextyear= original+1
    
while original < nextyear:
    dupnext= str(nextyear)
    if (dupnext[0]!=dupnext[1] and 
        dupnext[0]!=dupnext[2] and 
        dupnext[0]!=dupnext[3] and 
        dupnext[1]!=dupnext[2] and 
        dupnext[1]!=dupnext[3] and 
        dupnext[2]!=dupnext[3]):
        print(nextyear)
        break
    else:
       nextyear= nextyear+1
