Problem:
Score : 100 points

Problem Statement

On some day in January 2018, Takaki is writing a document. The document has a column where the current date is written in yyyy/mm/dd format. For example, January 23, 2018 should be written as 2018/01/23.

After finishing the document, she noticed that she had mistakenly wrote 2017 at the beginning of the date column. Write a program that, when the string that Takaki wrote in the date column, S, is given as input, modifies the first four characters in S to 2018 and prints it.

Constraints

S is a string of length 10.

The first eight characters in S are 2017/01/.

The last two characters in S are digits and represent an integer between 1 and 31 (inclusive).

Input

Input is given from Standard Input in the following format:

S

Output

Replace the first four characters in S with 2018 and print it.

Sample Input 1

2017/01/07

Sample Output 1

2018/01/07

Sample Input 2

2017/01/31

Sample Output 2

2018/01/31

Solution in Go (1.6) (judge verdict: Runtime Error)

package main

import (
    "fmt"
    "os"
    "bufio"
    "strings"
    "strconv"
)

func main() {
    var fp *os.File
    fp = os.Stdin
    reader := bufio.NewReaderSize(fp, 4096)
    line1 := readLine(reader)
    arr := strings.Split((line1), " ")
    N, _ := strconv.Atoi(arr[0])
    Y, _ := strconv.Atoi(arr[1])
	var k int
  
  	for i := 0; i < N; i++ {
     	for j := 0; j < N; j++ {
          	k = N - i - j
          
          	if (10000 * i + 5000 * j + 1000 * k) == Y && (i + j + k) == N {
                fmt.Println(strconv.Itoa(i) + " " + strconv.Itoa(j) + " " + strconv.Itoa(k))
            	return
            }
 		}   
 	}
  
	fmt.Println(strconv.Itoa(-1) + " " + strconv.Itoa(-1) + " " + strconv.Itoa(-1))
}

func readLine(reader *bufio.Reader) string {
    buf := make([]byte, 0, 1000000)

    for {
        l, p, e := reader.ReadLine()

        if e != nil {
            panic(e)
        }

        buf = append(buf, l...)

        if !p {
            break
        }
    }

    return string(buf)
}