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: Accepted)

#include <stdio.h>
#include <string.h>
int main(){
    int tamA, tamB;
    char stringA[100], stringB[100], stringC[100];
    scanf("%s", stringA);
    scanf("%s", stringB);
    scanf("%s", stringC);
    tamA = strlen(stringA);
    tamB = strlen(stringB);
    if (stringA[tamA-1] == stringB[0]){
        if (stringB[tamB-1] == stringC[0]){
            printf("YES\n");
        }
        else{
            printf("NO\n");
        }
    }
    else{
        printf("NO\n");
    }
    return 0;
}