How to extract value from argument as an array of function?

Today I had coding test of one company. I was given one question which I have faced following problem.

Input:
First line consists of an integer n representing the number of ID’s to be verified and the second line with n strings separated by a single space.

Output:
Display the entire ID’s that doesn’t satisfy the criteria(all ID should be of 6 digits)and if all the ID’s are valid, display 0.

Example 1:

Input

5

103010 12036 20260 2 661271

Output:
12036 20260 2

Example 2:

Input

6

123456 546788 235677 235980 457234

Output
0

Question was given

function sixthdigit (Countemployeeid) {
const Resultingid=[];
//write your code

return Resultingid;
}

var Countemployeeid =process.openStdin();
var Resultingid= sixthdigit (Countemployeeid) ;
console.log(Resultingid.length?Resultingid.join(''):0) 

My question is the argument Countemployeeid is contains two line, I can’t access the data from Countemployeeid, is it array, how to extract the value from it?