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()
n=int(a)
n+=1
a=str(n)
if a[0]!=a[1] or a[0]!=a[2] or a[0]!=a[3] or a[1]!=a[2] or a[1]!=a[3] or a[2]!=a[3]:
    while a[0]==a[1] or a[0]==a[2] or a[0]==a[3] or a[1]==a[2] or a[1]==a[3] or a[2]==a[3]: 
        n+=1
        a=str(n)
    print(n)
else:
    while a[0]==a[1] or a[0]==a[2] or a[0]==a[3] or a[1]==a[2] or a[1]==a[3] or a[2]==a[3]: 
        n+=1
        a=str(n)
    if n==int(a):
        print(n+1)
    else:
        print(n)