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.
cond = False
year = input("Enter a year: ")
lst=set()
year = str(int(year)+1)

while cond == False:
    year_length= len(year)
    for i in str(year):
        lst.add(i)
    if len(lst) == year_length:
        cond = True
        print(year)
    else:
        year = str(int(year)+1)
        lst=set()
