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.
a=int(input())
def a(b):
    d=set()
    while b>0:
        d=b%10
        if i in d:
            return False
        d.add(d)
        b//=10
    return True
ans=y+1
while not a(ans):
    ans=ans+1
print(ans)
    