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 <stdlib.h>
#include <string.h>
#include <math.h>

int main() {
  int i, j;
  int la, lb, lc;

  char a[20];
  char b[20];
  char c[20];

  //scanf("%[^\n]%*c", a);
  scanf("%s%*c", a);
  scanf("%s%*c", b);
  scanf("%s%*c", c);
  la = strlen(a);
  lb = strlen(b);
  lc = strlen(c);

  if (a[la-1] != b[0]) {
    printf("NO");
  }
  else if (b[lb-1]!=c[0]) {
    printf("NO");
  }
  else {
    printf("YES");
  }

  return 0;
}