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.
my_str=int(input())

while True:
    my_str +=1
    a=(set(str(my_str)))
    if len(a)==4:
        break
    else:
        pass
    
print(my_str)