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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

function Main(input)
{
  input = input.split("\n");
  /*
  for(let i=0;i<input.length;i+=1)
  {
    console.log(solver(input[i]));
  }
  */
  console.log(solver(input[0]));
}

function solver(arg)
{
  const pattern=/s$/;
  return pattern.test(arg)?
  	arg+"es":arg+"s";
}
  



Main(require("fs").readFileSync("/dev/stdin","utf8"));