Problem:
Score : 100 points

Problem Statement

You are given three strings A, B and C. Check whether they form a word chain.

More formally, determine whether both of the following are true:

The last character in A and the initial character in B are the same.

The last character in B and the initial character in C are the same.

If both are true, print YES. Otherwise, print NO.

Constraints

A, B and C are all composed of lowercase English letters (a - z).

1 ≤ |A|, |B|, |C| ≤ 10, where |A|, |B| and |C| are the lengths of A, B and C, respectively.

Input

Input is given from Standard Input in the following format:

A B C

Output

Print YES or NO.

Sample Input 1

rng gorilla apple

Sample Output 1

YES

They form a word chain.

Sample Input 2

yakiniku unagi sushi

Sample Output 2

NO

A and B form a word chain, but B and C do not.

Sample Input 3

a a a

Sample Output 3

YES

Sample Input 4

aaaaaaaaab aaaaaaaaaa aaaaaaaaab

Sample Output 4

NO

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;


public class Main{

	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		String ans = "YES";
		String A = reader.next();
		String B = reader.next();
		String C = reader.next();
		char a1 = A.charAt(A.length()-1);
		char b1 = B.charAt(0);
		char b2 = B.charAt(B.length()-1);
		char c1 = C.charAt(0);
		if (a1 != b1 || b2 != c1) {
			ans = "NO";
		}



		System.out.println(ans);
		reader.close();

	}

}