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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.Scanner;


public class Main {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		
		String A = sc.next();
		String B = sc.next();
		String C = sc.next();
		
		int a = A.length();
		int b = B.length();
		
		char Bfirst = B.charAt(0); 
		char Cfirst = C.charAt(0);
		
		char Alast = A.charAt(a-1);
		char Blast = B.charAt(b-1);
		
		if((Bfirst == Alast) & (Cfirst == Blast)){
			System.out.println("YES");	
		}else{
			System.out.println("NO");
		}
		
	}

}