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.
def isdistinct(num):
    ele=[]
    while num!=0:
        if num%10 not in ele:
            ele.append(num%10)
            num=num//10
        else:
            return False
    return True
year = int(input())
while True:
    year+=1
    if isdistinct(year):
        print(year)
        break