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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Data;
using System.Linq;
using System.Numerics;
using System.Text.RegularExpressions;

class Program
{
    static long[] ReadLongs()
        => Console.ReadLine()
            .Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries)
            .Select(s => long.Parse(s))
            .ToArray();

    static void Main(string[] args)
    {
        string s = Console.ReadLine();
        if (s.EndsWith("s"))
        {
            Console.WriteLine(s + "es");
        }
        else
        {
            Console.WriteLine(s + "s");
        }
    }
}