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.
g = input()
god = int(g)
f = True
ff= False
while not ff:
    god+=1
    g=str(god)
    f=True
    for i in range (len(g)-1):
        for j in range(i+1,len(g)):
            if g[i]==g[j]:
                f = False
    if f:
        print(god)
        ff=True

