Problem:
Score : 100 points

Problem Statement

In the Kingdom of AtCoder, people use a language called Taknese, which uses lowercase English letters.

In Taknese, the plural form of a noun is spelled based on the following rules:

If a noun's singular form does not end with s, append s to the end of the singular form.

If a noun's singular form ends with s, append es to the end of the singular form.

You are given the singular form S of a Taknese noun. Output its plural form.

Constraints

S is a string of length 1 between 1000, inclusive.

S contains only lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

Print the plural form of the given Taknese word.

Sample Input 1

apple

Sample Output 1

apples

apple ends with e, so its plural form is apples.

Sample Input 2

bus

Sample Output 2

buses

bus ends with s, so its plural form is buses.

Sample Input 3

box

Sample Output 3

boxs

Solution in Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        String regex = "s\\Z";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(s);

        if(m.find()){
            System.out.println(s + "es");
        }
        else{
            System.out.println(s + "s");
        }
    }

}