import java.util.Scanner;
class Main{
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String a = scan.nextLine();
String b = scan.nextLine();
if (a.length()%2==0){
System.out.print(b);
int j=20;
for(int i=0; i<((j-2-a.length())/2); i++){
System.out.print(".");
}
System.out.print(a);
for(int i=0; i<((j-2-a.length())/2); i++){
System.out.print(".");}
System.out.print(b);
}
else
{
  System.out.print(b);
int j=20;
for(int i=0; i<((j-2-a.length())/2); i++){
System.out.print(".");
}
System.out.print(a);
for(int i=0; i<((j-2-a.length())/2); i++){
System.out.print(".");}
System.out.print("?");
System.out.print(b);
}
}}