import java.util.*;

public class ISC2019Q3 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("INPUT");
        String sentence=in.nextLine();
        MyString str = new MyString(sentence);
        System.out.println("OUPUT");
        if(str.isValid()){
            System.out.println(sentence);
            str.convertToPalindrome();
            System.out.println(str);
        }else{
            System.out.println("INVALID INPUT");
        }
        in.close();
    }
}
class MyString{
    private String sentence, words[];
    public MyString(String sentence){
        this.sentence=sentence;
    }
    public boolean isValid(){
        return ".?!".indexOf(sentence.charAt(sentence.length()-1))>=0;
    }
    public void convertToPalindrome(){
        String reverse="";
        int delta;
        sentence=sentence.substring(0, sentence.length()-1);
        words=sentence.split(" ");
        for( int i=0; i<words.length;i++){
            if(!isPalindrome(words[i])){
                reverse="";
                if(words[i].length()>2 && words[i].charAt(words[i].length()-1)==words[i].charAt(words[i].length()-2)){
                    delta=1;
                }else{
                    delta=0;
                }
                for(int position=0; position<words[i].length()-1-delta;position++){
                    reverse=words[i].charAt(position)+reverse;
                }
                words[i]=words[i]+reverse;
            }
        }
    }
    public static boolean isPalindrome(String source){
        int half=source.length()/2;
        for( int position=0; position<=half;position++){
            if(source.charAt(position)!=source.charAt(source.length()-1-position)) 
            return false;
        }
        return true;
    }
    public String toString(){
        String output="";
        for(String word:words){
            output+=word+" ";
        }
        return output;
    }
}