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.
n=int(input())
c=0
while(c==0):
    n+=1
    lis=[]
    t=n
    while(t>0):
        lis.append(t%10)
        t=t//10
    lis.sort()
    for i in range(0,len(lis)-1):
        if(lis[i]==lis[i+1]):
            c=1
    if(c==1):
        c=0
    else:
        c=1
print(n)
