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 JavaScript (Node.js 12.16.1) (judge verdict: Runtime Error)

function main(input) {
  input = input.trim();
  const [a,b,c] = input.split(" ").map(Number);

  if(a.slice(-1)==b.slice(0,1) && b.slice(-1)==c.slice(0,1)){
    console.log("Yes");
  }else{
    console.log("No");
  }

}
main(require("fs").readFileSync("/dev/stdin", "utf8"));