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 check_beautiful(year):
    year_check = list(map(int, str(year)))
    beautiful = True
    for i in range(len(year_check)):
        for j in range(i + 1, len(year_check)):
            if year_check[i] == year_check[j]:
                beautiful = False
    return beautiful


if __name__ == '__main__':
    year = int(input())
    while True:
        if check_beautiful(year + 1):
            print(year + 1)
            break
        year += 1        
        
    