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 distinct(s):
    l=[]
    while s>=1:
        l.append(s%10)
        s=s//10
    for i in range(len(l)):
        for j in range(i+1,len(l)):
            if(l[i]==l[j]):
                return False
    return True
n=int(input())
for i in range(n+1,9001):
    if(distinct(i)==True):
        print(i)
        break