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 distinct(year):
    years_str = str(year)
    if len(set(years_str)) == len(years_str):
        return True
    else: 
        return False
year = int(input()) + 1
check = False
while check == False:
    check = distinct(year)
    year = year + 1 
print(year - 1)