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())
c=0
y+=1
ys = str(y)

while c<1:
    for i in range(len(ys)):
        if ys.count(ys[i])>1:
            y+=1
            ys = str(y)
    if len(list(dict.fromkeys([*ys]))) == len(ys):
        c = 1
    
    
print(y)
