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 Rust (1.42.0) (judge verdict: Accepted)

#[allow(unused_imports)]
use proconio::marker::{Bytes, Chars};
use proconio::{fastout, input};
#[fastout]
fn main() {
    input! {
        s: String,
    }
    let len = s.len();
    let mut ans = false;

    if len == 7 && s == "keyence" {
        ans = true;
    }
    'outer: for i in 0..(len + 1) {
        for j in i + 1..(len + 1) {
            let mut str: String = s[0..i].to_string();
            str.push_str(&s[j..]);
            if str == "keyence" {
                ans = true;
                break 'outer;
            }
        }
    }
    if ans {
        println!("YES");
    } else {
        println!("NO");
    }
}