/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		//Let's make our objects that will be used in the loop
	    Scanner reader = new Scanner(System.in); 
	    ArrayList<String> words = new ArrayList<String>();
 
	    while (true) {
	        String input = reader.nextLine();
 
	        //Now that we have the input, we can check if it's already in the list:
	        if (words.contains(input)) {
	        	//If it is, then we need to break out of the loop. We can also give the user the error msg here
	        	System.out.println("You gave the word " + input +" twice"); 
	        	break;
	        } else {
	     		//If we got this far, it means the list doesn't contain our input, so we can add it to the list and move on
	     		words.add(input);
	        }
	    }
 
	    //Let's print out the resulting array to see what happened:
	    for (String word : words) {
	    	System.out.println(word);
	    }
	}
}

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