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()) + 1
def beautiful_year(year): # should return true or false
    is_beautiful = True
    i = 0
    while i < len(year) - 1:
        if year[i] in year[i+1:]:
            is_beautiful = False
        i+=1            
    return is_beautiful
while not beautiful_year(str(year)):
    year = int(year) + 1
print(year)

