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 rr(x):
    global a
    b = list(int(i) for i in str(a))
    q = 0
    for i in b:
        if b.count(i) > 1:
            q =1

    return q

while True:
    a+=1
    if rr(a) == 0:
        break
        
print(a)

