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(n):
    n = list(map(int, str(n).strip()))
    for item in n:
        if n.count(item) > 1:
            return False
    return True

def beautiful(h):
    while True:
        h += 1
        if check(h):
            return h

if __name__ == "__main__":
    y = int(input())
    print(beautiful(y))