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)

//#pragma GCC optimize(2)
// Happy TLE and WA every day!
// by: zxb the vegetable chicken
#include<bits/stdc++.h>
#define mp              make_pair
#define rep(i,n)        for(int i = 0; i < n; i++)
#define foreach(i,c)    for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define BINF            0x7fffffff
#define INF             0x3f3f3f3f
#define LINF            4557430888798830399
#define END(s)          {cout<<s; return 0;}
#define CON(s)          {cout<<s; continue;}
#define BRE(s)          {cout<<s; break;}
#define pb              push_back
#define All(a)          a.begin(), a.end()  //with A in CAPITAL!!!
#define sz(a)           (int)a.size()
#define F               first
#define S               second
#define Time            clock()/CLOCKS_PER_SEC
//#define usingFiles
using namespace std;

typedef unsigned int ui;
typedef pair<int, int> pii;
typedef long long ll;

inline bool Read(int& x){
	x = 0;
	int c;
	int sign = 1;
	while( (c = getchar()) < '0' || c > '9' ) if(c == '-') sign = -1;
	x = c ^ '0';
	while( (c = getchar()) >= '0' && c <= '9' ) x = (x<<3) + (x<<1) + (c ^ '0');
	x *= sign;
	return 1;
}

inline bool Write(int x){
	if(x >= 10) Write(x / 10);
	putchar(x % 10 + '0');
	return 1;
}

const int rp = 666666;
const bool debug = 1;
const bool I_good_vegetable_a = 1;

string s;

signed main(){
	ios::sync_with_stdio(false);
	#ifdef usingFiles
		freopen("input.txt", "r", stdin);
		freopen("output.txt", "w", stdout);
	#endif
	cin >> s;
	rep(i, s.size() + 1){
		for(int j = i; j < s.size() + 1; j++){
			if(s.substr(0, i) + s.substr(j, s.size() - j) == "keyence"){
				cout << "YES\n";
				return 0;
			}
		}
	}
	cout << "NO\n";
	return 0;
}