Score : $100$ points
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:
If both are true, print
YES. Otherwise, print
Input is given from Standard Input in the following format:
$A$ $B$ $C$
rng gorilla apple
They form a word chain.
yakiniku unagi sushi
$A$ and $B$ form a word chain, but $B$ and $C$ do not.
a a a
aaaaaaaaab aaaaaaaaaa aaaaaaaaab