premier mot = première lettres des mots suivants

import java.util.*;
import java.io.*;
import java.math.*;

class Solution {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String m = in.nextLine();
        String first = m.split(" ")[0];
        String g = m;
        m = m.replaceAll(first,"").trim();
        int i = 0;
        String rep = "";
        if(g.split(" ").length == 1)
        {
            String x = "";
            for(char c : g.toCharArray())
            {
                x += c + " ";
            }
            System.out.println(x.trim());
        }
        else
        {
            for(String x : m.split(" "))
            rep += first.charAt(i++)+x + " ";
            System.out.print(rep.trim());
        }

            //
    }
}