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: Runtime Error)

using System;
using System.Collections.Generic;
using System.Linq;

namespace abc085c
{
    class Program
    {
        static void Main(string[] args)
        {
            
            string[] input = Console.ReadLine().Split(' ');

            int n = int.Parse(input[0]);
            int y = int.Parse(input[1]);

            var array = new int[3];
            var rest = 0;

            array[0] = y / 10000;
            rest = y - 10000 * array[0];
            array[1] = rest / 5000;
            rest = rest - 5000 * array[1];
            array[2] = rest / 1000;

            var sum = array.Sum();
            var d = sum - n;

            if(d == 0){
                Console.WriteLine(String.Join(" ", array));
            }else{
                
                var flag = false;
                var lim = array[0];
                for (var i = 0; i < lim; i++){
                    array[0]--;
                    array[1] += 2;
                    sum = array.Sum();
                    d = n - sum;
                    if(d < 0){
                        break;
                    }else{
                        if (d == 0)
                        {
                            flag = true;
                            break;
                        }
                        else
                        {
                            if (d % 4 == 0 && d / 4 <= array[1])
                            {
                                array[1] -= d / 4;
                                array[2] += d / 4 * 5;
                                flag = true;
                                break;
                            }
                        }
                    }

                }
                if(flag){
                    Console.WriteLine(String.Join(" ", array));
                }else{
                    Console.WriteLine("-1 -1 -1");
                }
            }

        }


    }

   
}