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(a):
    number=str(a)
    for i in range(0,len(number)-1):
        for j in range(i+1,len(number)):
            if(number[i]==number[j]):
                return 0
    return 1
n=int(input())
output=n+1
while(distinct(output)!=1):
    output+=1
else:
    print(output)