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.
input_year = int(input())

def check_distinct(year):
    year = list(str(year))
    for x in range(4):
        current = year.pop(0)
        if current in year:
            return False
    return True

ans = input_year
found = False

while found == False:
    ans += 1
    found = check_distinct(ans)

print(ans)
