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

Author: sandodev

Examples
inputCopy
1987
outputCopy
2013

inputCopy
2013
outputCopy
2014
"""

y = input()
y = str(int(y)+1)

numbers = []
finded_number = True
number_final = ""
while finded_number:
    for n in y:
        if n not in numbers:
            numbers.append(n)

    if len(numbers) == 4:
        number_final = "".join(numbers)
        finded_number = False
    else:
        y = str(int(y)+1)
        numbers = []

print(number_final)
