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.
y = input()

while True:
    y = str(int(y)+1)
    a = ''
    for i in range(4):
        if y[i] not in a:
            a+=y[i]
    if len(y)==len(a):
        break
print(y)