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.
# LUOGU_RID: 116691648
n=int(input())
n=n+1
while 1==1:
    s=str(n)
    if(s[0]!=s[1] 
       and s[2]!=s[3] 
       and s[0]!=s[2] 	   
       and s[0]!=s[3] 
       and s[1]!=s[2] 
       and s[1]!=s[3]):
        print (n)
        break
    else:
        n=n+1

