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 has_different_digits(year):
    year_str = str(year)
    return len(set(year_str)) == len(year_str)
    
def next_year(current_year):
    current_year+=1
    while has_different_digits(current_year) is not True:
        current_year+=1
    return current_year

y= int(input())
result = next_year(y)
print(result)


                




        
