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 solve():
    x = int(input())
    while True:
        x+=1
        if is_diff(str(x)):
            print(x)
            return


def is_diff(x):
    for i in range(len(x)):
        for j in range(i):
            if x[i] == x[j]:
                return False
            
    return True


solve()