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 check(number):
    string=str(number)
    string_list=[]
    flag=0
    for i in string:
        if i in string_list:
            flag=1
        else:
            string_list+=[i,]
            pass

    if flag==0:
        return True
    else:
        return False
    

year=int(input())
for i in range(year+1,9000):
    if check(i)==True:
        print(i)
        break
    else:
        i+=1
        pass

