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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

    function Main(input) {
        keyence = ["k", "e", "y", "e", "n", "c", "e"];
        answer = "NO";
      input = input.split("")
        for(i = 0; i < 7; i++){
            var tr = true;
          
            for(j = input.length-1; j > input.length - (8-i); j--){
                if(input[j] !== keyence[6-(8-j)]){
                    tr = false;
                }
            }
            for(k = 0; k < i; k++){
                if(input[k] !== keyence[k]){
                    tr = false;
                }
            }
            if(!tr) continue;
            answer = "YES";
        }
        console.log(answer);
    }


Main(require("fs").readFileSync("/dev/stdin", "utf8"));