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.
def fun(d):
    c=0
    for i in range(len(d)):
        e=0
        for j in range(len(d)):
            if(j!=i):
                if(d[i]!=d[j]):
                    e=e+1
        if(e==len(d)-1):
            c=c+1
    if(c==len(d)):
        return True;
    else:
        return False;

n=int(input())
d=str(n+1)
while(True):
    x=fun(d)
    if(x):
        print(d)
        break
    else:
        d=str(int(d)+1)