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=input()
b=int(a)+1
z=1
while z!=0:
    c=str(b)
    b+=1
    d=[] 
    for x in c:
        d.append(x)
    e=0
    z=0
    f=sorted(d)
    while e<3:
        if f[e]==f[e+1]:
            z=1
        e+=1
print(c)