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-----
rng gorilla apple

-----Sample Output-----
YES

They form a word chain.

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