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.
a = int(input())
first = 1
second = 2
third = 3
fourth = 4
g = False
while not g:
    a += 1
    first = a // 1000
    second = (a % 1000) // 100
    third = (a % 100) // 10
    fourth = a % 10
    if (first != second and first != third and first != fourth) and (second != third and second != fourth) and (
                third != fourth):
        first = str(first)
        second = str(second)
        third = str(third)
        fourth = str(fourth)
        result = first + second + third + fourth
        break
print(result)