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(""))
l=[]
a+=1
while len(l)!=1:
    x=str(a)
    for i in range(3):
        if int(x[i])!=int(x[i+1]):
            print(x)
            l.append(x)
            break
    a+=1