Problem:
Score : 100 points

Problem Statement

Dolphin loves programming contests. Today, he will take part in a contest in AtCoder.

In this country, 24-hour clock is used. For example, 9:00 p.m. is referred to as "21 o'clock".

The current time is A o'clock, and a contest will begin in exactly B hours.
When will the contest begin? Answer in 24-hour time.

Constraints

0 \leq A,B \leq 23

A and B are integers.

Input

The input is given from Standard Input in the following format:

A B

Output

Print the hour of the starting time of the contest in 24-hour time.

Sample Input 1

9 12

Sample Output 1

21

In this input, the current time is 9 o'clock, and 12 hours later it will be 21 o'clock in 24-hour time.

Sample Input 2

19 0

Sample Output 2

19

The contest has just started.

Sample Input 3

23 2

Sample Output 3

1

The contest will begin at 1 o'clock the next day.

Solution in Haskell (GHC 7.10.3) (judge verdict: Accepted)

import Data.Maybe
import Data.List

main :: IO ()
main = do
  input <- getContents
  putStrLn $ trim (solve (trim input))

--処理
solve :: String -> String
solve s = show $ (a + b) `mod` 24 where [a, b] = fmap read (words s) :: [Int]

trimHead :: String -> String
trimHead = dropWhile (\s -> isJust (elemIndex s [' ', '\t', '\n', '\r']))

trim :: String -> String
trim = reverse . trimHead . reverse . trimHead