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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