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>
int main()
{
    char ar[100],br[100],cr[100];
    int i=0;
    
    scanf ("%s %s %s",ar,br,cr);
    int p,q,r;
    p=strlen(ar);
    q=strlen(br);
    r=strlen(cr);

    if (ar[p-1]==br[0] && br[q-1]==cr[0])
    {
        printf ("YES\n");
    }
    else if (ar[p-1]!=br[0] || br[q-1]!=cr[0])
    {
        printf ("NO\n");
    }
    return 0;
}