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.
import sys


def is_beautiful(year: str) -> bool:
    return len(year) == len(set(year))

def solution(input_data: str):
    year = input_data
    for y in range(int(year) + 1, 9000 + 1):
        if is_beautiful(str(y)):
            return y
    return -1


def test_solution():
    assert solution("1987") == 2013
    assert solution("2013") == 2014


if __name__ == '__main__':
    print(solution(sys.stdin.read().strip()))
