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())

while True:
    x += 1
    a_var = x // 1000
    b_var = (x // 100) % 10
    c_var = (x // 10) % 10
    d_var = x % 10
    if a_var != b_var and a_var != c_var and a_var != d_var and b_var != c_var and b_var != d_var and c_var != d_var:
        break

print(x)
