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 Python (3.8.2) (judge verdict: Runtime Error)

import numpy as np
num=input().split(' ')
count=0
plot=np.zeros([int(num[0]),int(num[0])])
t=[]
for a in range(int(num[1])):
  tmp=input().split(' ')
  t.append([int(tmp[0])+a for a in range(int(tmp[1])-int(tmp[0])+1)])
for a in range(int(num[0])):
  if a==0:
    plot[0,0]=1
  else:
    for posit in np.where(plot[a-1]>0)[0]:
      for b in t:
        for c in b:
          if posit+c<int(num[0]):
	          plot[a,posit+c]+=plot[a-1,posit]
xx=int(np.sum(plot[:,-1]))
print(xx%998244353)