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.
def f(x):
    for i in list(str(x+1)):
        if list(str(x+1)).count(i)>1:
             return 1
             break
    else:
        return 0

year=int(input())
while f(year)==1:
    year+=1
else:
    print(year+1)