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.
x = input()
flag = False
x = str(int(x) + 1)
while not flag:
    sec_flag = True
    for i in range(4):
        for j in range(i+1, 4):
            if x[i] == x[j]:
                sec_flag = False
                break
    if sec_flag:
        flag = True
        print(x)
    else:
        x = str(int(x) + 1)

                
    