using System;

/*

QuestionMarks exercise

Have the function QuestionsMarks(str) take the str string parameter, containing single-digit numbers, 

letters, and question marks. The function checks if there are precisely 3 question marks between 

every pair of two numbers that sum up to 10. 

If so, your program should return the string true, otherwise it should return the string false. 

For example: 

if str is "arrb6???4xxbl5???eee5" then your program should return true because there are precisely 3 

question marks between 6 and 4, and 3 question marks between 5 and 5 at the end of the string. 

Other runs:

"arrb6???4xxbl5???eee5" → true

"aa6?9" →false

"acc?7??sss?3rr1??????5" → true

"acc?7??sss?3rr7??????5" → false

function QuestionsMarks(str) {

// code goes here

return str;

}

// keep this function call here

QuestionsMarks(readline());

*/

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        QuestionsMarks(readline());

    }

    function QuestionsMarks(str) {

    // code goes here

    return str;

    }

}