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 = int(input())
x += 1
while True:
    xstr = str(x)
    if xstr[0] == xstr[1] or xstr[0] == xstr[2] or xstr[0] == xstr[3]:
        if xstr[0] == xstr[1]:
            x += 100
        elif xstr[0] == xstr[2]:
            x += 10
        else:
            x += 1
        continue
    elif xstr[1] == xstr[2] or xstr[1] == xstr[3]:
        if xstr[1] == xstr[2]:
            x += 10
        else:
            x += 1
        continue
    elif xstr[2] == xstr[3]:
        x += 1
        continue
    else:
        break
print(x)