题目描述
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.
Examples
Input
rng gorilla apple
Output
YES
Input
yakiniku unagi sushi
Output
NO
Input
a a a
Output
YES
Input
aaaaaaaaab aaaaaaaaaa aaaaaaaaab
Output
NO
输入格式
见题面
输出格式
见题面
样例输入
a a a
样例输出
YES