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.

Input

Input is given from Standard Input in the following format:
A B C

Output

Print YES or 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.

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

见题面 Input 部分

见题面 Output 部分