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())
s = ""
st = {""}
for i in range(n+1,9000+1):
    s = str(i)
    st = {""}
    st.add(s[0])
    st.add(s[1])
    st.add(s[2])
    st.add(s[3])
    if (len(st)==5):
        print(i)
        break