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.
# https://codeforces.com/problemset/problem/271/A



def solve():
    return 0


def main():
    y = int(input())+1
    year_dict = {}
    i = 0
    while True:
        for dig in str(y):
            if dig not in year_dict:
                year_dict[dig] = 1
                i += 1
        
        year_dict = {}
        if i == 4:
                break
        y += 1
        i = 0
    print(y)

if __name__ == '__main__':
    main()