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 getClosestYear(year):
    count_year = int(year);
    
    while True: 
        count_year += 1
        if(len(year) == len(set(str(count_year)))):
            break;
    return count_year



def main():
    year = input()
    ans = getClosestYear(year)
    print(ans)
    
if(__name__ == "__main__"):
    main()