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.
old_year = int(input())
arr = set()
while True:
    old_year = str(old_year + 1)
    for i in range(4): arr.add(old_year[i])
    if len(arr) < 4: 
        old_year = int(old_year)
        arr.clear()
    else:break
print(old_year)