C# solution

using System; using System.Collections.Generic; using System.IO; class Solution { static void Main(String[] args) {

    int n = Convert.ToInt32(Console.ReadLine());  // Read number of test cases (but it's unused)

    // Convert string to character array

   for(int i=0; i<n;i++){
     string characters = Console.ReadLine(); 
    string result=checkChar.checkindex(characters);
    Console.WriteLine(result);
   }
      // Print result
}
class checkChar{

    public static string checkindex(string characters){
        // Read input string

string even = ""; // Initialize with empty string string odd = "";

    char[] chars = characters.ToCharArray(); 
         for (int i = 0; i < characters.Length; i++) {  // Fix loop (start from 0, use <)
        if (i % 2 == 0) {  // Check if index is even
            even += chars[i]; 
        } else {
            odd += chars[i];
        }
    }
    return even + " "+ odd;

    }
}

}