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# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Runtime.CompilerServices;
using static System.Math;

class P
{
    static void Main()
    {
        string s = Console.ReadLine();
        for (int i = 0; i < s.Length; i++)
        {
            for (int j = 0; j < s.Length - i; j++)
            {
                if("keyence" == s.Substring(0, i) + s.Substring(i + j))
                {
                    Console.WriteLine("YES");
                    return;
                }
            }
        }
        Console.WriteLine("NO");
    }
}


static class Writer
{
    public static void WriteLine<T>(this T item) => Console.WriteLine(item);

    public static void WriteLog<T>(this T item) => Debug.WriteLine(item);
}