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 time import *
from math import *
from random import *
y = int(input())
z = str(y)
a = y + 1
o = str(a)
ans = 0
def fan(o):
    p = 0
    if o[0] != o[1] and o[0] != o[2] and o[0] != o[3] and o[1] != o[2] and o[1] != o[3] and o[2] != o[3]:
        p = 1
    else:
        p = -1
    return p
for i in range(y, 11000):
    if fan(o) == 1:
        ans = a
        break
    else:
        a += 1
        o = str(a)
print(ans)

    
    
