Answer:
import java.util.*;
public class MyClass {
    public static void main(String args[]) {
        Scanner input = new Scanner(System.in);
        System.out.print("Input a word: ");
        String userinput = input.nextLine();
        for(int i =0;i<userinput.length();i+=2) {
            System.out.print(userinput.charAt(i));
        }
    }
}
Explanation:
This line prompts user for input
        System.out.print("Input a word: ");
This declares a string variable named userinput and also gets input from the user
        String userinput = input.nextLine();
The following iterates through every other character of userinput from the first using iteration variable i and i is incremented by 2
        for(int i =0;i<userinput.length();i+=2) {
This prints characters at i-th position
            System.out.print(userinput.charAt(i));