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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main(void) {
	char A[11], B[11], C[11];
	int i,j;
	scanf("%s", A);
	scanf("%s", B);
	scanf("%s", C);
	for (i = 0; A[i] != '\0';i++) {
	}
	for (j = 0; B[j] != '\0'; j++) {
	}
	
	if (A[i-1]==B[0]) {
		if (B[j - 1] == C[0]) {
			printf("YES");
			printf("\n%d\n%d", i,j);
		}
		else {
			printf("NO");
		}
	}
	else {
		printf("NO");
	}
	return 0;
}