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++14 (GCC 5.4.1) (judge verdict: Accepted)

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <vector>
#include <utility>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <tuple>
#include <set>
#include <map>
#include <functional>
#include <cmath>
#include <cstring>
using namespace std;
#define sci(n) scanf("%lld", &(n))
#define scd(n) scanf("%Ld", &(n))
typedef long long LL;
typedef long double LD;
typedef pair<LL, LL> pll;

int main(void)
{
	string s;
	cin >> s;
	for (int i = 0; i < s.length();i++) {
		for (int j = 0; j+i <= s.length(); j++) {
			string scp(s);
			scp.erase(i,j);
			if (scp == "keyence") {
				cout << "YES";
				return 0;
			}
		}
	}
	cout << "NO";
	return 0;
}