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.
n=int(input())
while(1):
    n += 1;
    a = n // 1000;
    b = n // 100 % 10;
    c = n // 10 % 10;
    d = n % 10;
    if (a != b and a != c and a != d and b != c and b != d and c != d):
            break;
print(n)