import java.util.*;

public class Program3{
  
  String text, key;
  
  //main method
  public static void main(String[] args) {
    
    //variables
    String strIn, codeIn, strOut, methodChoice;

    Scanner in = new Scanner(System.in);
    System.out.print("Enter the text for coding: ");
    strIn = in.nextLine();

    System.out.print("Enter the key ");
    codeIn = in.nextLine();
    
    Program3 sa = new Program3(strIn,codeIn);  

    System.out.print("Would you like to encode or decode? ");
    methodChoice = in.next();
    
    if(methodChoice.equals("encode") || methodChoice.equals ("Encode") || methodChoice.equals("ENCODE")){
      System.out.println("Encoding...");
      strOut = sa.encode(sa.text, sa.key);
    } else if(methodChoice.equals("decode") || methodChoice.equals ("Decode") || methodChoice.equals("DECODE")){
      System.out.println("Decoding...");
      strOut = sa.decode(sa.text, sa.key);
    } else{
      System.out.println("Error. Invalid input.");
      strOut = "No coding work performed due to error.";
    }
    
    System.out.println("Resulting text is "+strOut);
    
  }
  
  
  //constructor
  public Program3(String inString, String n){
    text = inString;
    key = n;
  }
  
  
  public String encode(String str, String n){
    
    int size = str.length();
    
    StringBuilder sb = new StringBuilder(str);
    
    for(int index = 0; index < size; index++){
      char letter = sb.charAt(index);
      
      if(letter == 'a' || letter == 'A' || letter == 'e' || letter == 'E' || letter == 'i' || letter == 'I'){
        
        sb.insert(index,n);
        index += n.length();
        size += n.length();
        
      }
      
      if(letter == 'o' || letter == 'O' || letter == 'u' || letter == 'U'){
        
        sb.insert(index,"foo");
        index += 3;
        size += 3;
        
      }
    }
    
    return sb.toString();
    
  }
  
  
  public String decode(String str, String n){
    
    int size = str.length();
    
    StringBuilder sb = new StringBuilder(str);
    
    for(int index = 0; index < size; index++){
      char letter = sb.charAt(index);
      
      if(letter == 'a' || letter == 'A' || letter == 'e' || letter == 'E' || letter == 'i' || letter == 'I'){
        
        
      }
      
      if(letter == 'o' || letter == 'O' || letter == 'u' || letter == 'U'){
        
        sb.replace(index-3,index-1,"");
        index -= 3;
        size -= 3;
      }
    }
    
    return sb.toString();
    
  }
}