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>
char a[100],b[100],c[100];
int main()
{
    int i,j,s1,s2;
    scanf("%s[^\t]",a);
    scanf("%s[^\t]",b);
    scanf("%s[^\t]",c);
    for(s1=0;a[s1]!='\0';s1++);
    for(s2=0;b[s2]!='\0';s2++);
    if(a[s1-1]==b[0] && b[s2-1]==c[0])
    {
        printf("YES\n");
    }
    else
    {
        printf("NO\n");
    }
    return 0;
}