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.
from collections import defaultdict
y = int(input())
map1 = defaultdict(int)
for i in range(y+1, 9013):
    flag = 1
    map1.clear()
    for j in str(i):
        if j not in map1:
            map1[j] += 1
        else:
            flag = 0
            break
    if flag == 1:
        print(i)
        break
