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 is_distinct(n):
    n=str(n)
    return len(set(n))==len(n)

def solve(n):
    while True:
        n+=1
        if is_distinct(n):
            return n

n=int(input())
print(solve(n))