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`.
a, b, c = input().split()
if a[0] == b[-1] and b[0] == c[-1]:
    print('YES')
else:
    print('NO')
a, b, c = input().split()
if a[-1] == b[0] and b[-1] == c[0]:
    print('YES')
else:
    print('NO')