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<ctype.h>
 
int main(void) {
  char a[12],b[12],c[12];
  int wa,wb;
  scanf("%s %s %s",a,b,c);
  for (wa = 0;wa < 12;wa++) {
    if(isalpha(a[wa]) == 0) {
      wa--;
      break;
    } 
  }
  for (wb = 0;wb < 12;wb++) {
    if(isalpha(b[wb]) == 0) {
      wb--;
      break;
    } 
  }
  if(a[wa] == b[0] && b[wb] == c[0]) {
    printf("YES\n");
  } else {
    printf("NO\n");
  }
  return 0;
}