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()
{
  char A[11],B[11],C[11];
  int a,b,i;
  
  fgets(A,sizeof(A),stdin);
  fgets(B,sizeof(B),stdin);
  fgets(C,sizeof(C),stdin);
  
  for(i=1;i<11;i++){
	if(A[i]=='\0'){
      a=i-2;
      break;
    }
  }
    
  for(i=1;i<11;i++){
    if(B[i]=='\0'){
      b=i-2;
      break;
    }
  }
  
  if(A[a]==B[0]){
    if(B[b]==C[0]){
      printf("YES");
    }
  }else{
    printf("NO");
  }
  
  return 0;
}