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;

class AtCoder
{
    static void Main()
    {
        bool f = false;
        string[] s;       
        s = NextS();
        string t = s[0];
        string u;
        for(int i=0; i<t.Length; i++)
        {
            for(int j=i; j<t.Length; j++)
            {
                u = t.Substring(0, i) + t.Substring(j);
                if (u == "keyence") f = true;
            }
        }
        if (f) Console.WriteLine("YES");
        else Console.WriteLine("NO");
    }

    static void DebugWL(object x) { System.Diagnostics.Debug.WriteLine(x); }
    static string[] NextS() { return Console.ReadLine().Trim().Split(' '); }
}