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.
year=int(input())
flag=True
while(flag):
    year+=1
    a=int(year / 1000)
    b=int(year / 100 %10)
    c=int(year / 10 % 10)
    d=int(year % 10)
    
    if a!=b and a!=c and a!=d and b!=c and b!=d and c!=d:
        flag=False
print(year)
    