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 (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(){
  int i;
  char S[1003];
  scanf("%s",S);

  for (i = 0; i < 1001; i++)
  {
    if (S[i]=='\000'){ 
      break;
    }
  }
  
  if(S[i-1]!='s'){
    S[i]='s';
    S[i+1]='\000';
  }else{
    S[i]='e';
    S[i+1]='s';
    S[i+2]='\000';
  }
  
  for (int j = 0; j < i+2; j++)
  {
    printf("%c",S[j]);
  }
  
  return 0;
}