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.
y = int(input())
def compare(a):
    f = False
    a=str(a)
    a = a.strip()
    b = set(a)
    if(len(a) == len(b)):
        f = True
    return f
y += 1
while(not compare(y)):
    y += 1
print(y)
