Given three strings $a$, $b$ and $c$, your mission is to check whether $c$ is the combine string of $a$ and $b$. A string $c$ is said to be the combine string of $a$ and $b$ if and only if $c$ can be broken into two subsequences, when you read them as a string, one equals to $a$, and the other equals to $b$. For example, ``adebcf'' is a combine string of ``abc'' and ``def''.
输入解释
Input file contains several test cases (no more than 20). Process to the end of file. Each test case contains three strings $a$, $b$ and $c$ (the length of each string is between 1 and 2000).
输出解释
For each test case, print ``Yes'', if $c$ is a combine string of $a$ and $b$, otherwise print ``No''.