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 = int(input())
valid = True

while valid:
    y += 1
    cnt = 0
    str_y = str(y)
    for i in reversed(range(len(str_y))):
        if str_y[i] in str_y[:i]:
            break
        else:
            cnt += 1
    if cnt == len(str_y):
        valid = False
            
print(y)
