Problem:
Score : 200 points

Problem Statement

A string is called a KEYENCE string when it can be changed to keyence by removing its contiguous substring (possibly empty) only once.

Given a string S consisting of lowercase English letters, determine if S is a KEYENCE string.

Constraints

The length of S is between 7 and 100 (inclusive).

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is a KEYENCE string, print YES; otherwise, print NO.

Sample Input 1

keyofscience

Sample Output 1

YES

keyence is an abbreviation of key of science.

Sample Input 2

mpyszsbznf

Sample Output 2

NO

Sample Input 3

ashlfyha

Sample Output 3

NO

Sample Input 4

keyence

Sample Output 4

YES

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(){
  char key[]="keyence";
  char S[102];
  int ans=0;
  int i=0;
  while ((S[i]=getchar())!=EOF){i++;}
  
  char *h=S,*t=&S[i-1];
  int j=0;
  while (*h++==key[j]){
    if (j==6){ans=1;}
    j++;
    }
  int k=6;
  while (*t--==key[k])
  {
    if(7-j==7-k){ans=1;}
    k--;
  }
  
  ans > 0 ? puts("YES"):puts("NO");

  return 0;
}