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())
for i in range(n+1, 9000):
    tmp = i
    d = tmp % 10
    tmp//=10
    c = tmp % 10
    tmp//=10
    b = tmp % 10
    tmp//=10
    a = tmp % 10
    if len({a,b,c,d})==4:
        print(1000*a+100*b+10*c+d)
        break;