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.
Year = int(input())+1

def isYearUnique(CurrentYear):
    Unique = True
    UsedNum = ""
    for num in str(CurrentYear):
        if UsedNum.find(num) != -1:
            Unique = False
            break
        UsedNum += num
    return Unique

while not isYearUnique(Year):
    Year += 1

print(Year)