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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using static System.Console;
public class Hello{
    public static void Main(){
//        string[] a = ReadLine().Split(' ');
//        int x = int.Parse(a[0]);
//        int y = int.Parse(a[1]);
//        int z = int.Parse(a[2]);
        string b = ReadLine();
//        int count = 0;
//        if(b[0] == 'o'){ count++; }
//        if(b[1] == 'o'){ count++; }
//        if(b[2] == 'o'){ count++; }
        b = b.Replace("2017","2018");
        WriteLine(b);
    }
}