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.
a=int(input())
a+=1
s=str(a)
while(True):
    if((s[0]==s[1])or(s[0]==s[2])or(s[0]==s[3])or(s[2]==s[1])or(s[3]==s[1])or(s[3]==s[2])):
        a+=1
        s=str(a)
    else:
        break
print(a)