import java.util.*;

public class Lab3 {
    public static void main(String[] args){
        char answer;
        Scanner scanner = new Scanner(System.in);
        do{
            System.out.println("Enter the text:");
            StringBuffer sb = new StringBuffer(scanner.nextLine().replaceAll("\s+", " ").trim());
            System.out.println(deleteDuplicatesFromString(sb));
            System.out.println("Continue checking another text? (y/n)");
            answer = scanner.nextLine().trim().charAt(0);
        } while (answer != 'n');
    }

    public static StringBuffer deleteDuplicatesFromString(StringBuffer inputString){
        StringBuffer temp = new StringBuffer(inputString);
        String[] words = inputString.toString().split("(([\.,])(\s+))|\s");
        temp.delete(0, temp.length());
        if(inputString.length() < 2 || inputString == null){
            return inputString;
        }
        else{
            for(String word : words){
                char distChar = word.charAt(0);
                temp.append(distChar);
                for(int i = 0; i < word.length(); i++){
                    if(distChar != word.charAt(i)){
                        temp.append(word.charAt(i));
                    }
                }
                temp.append(" ");
            }
            return temp;
        }

    }
}