Median string 
Time limit:  1.00 s 
Memory limit:  512 MB 

Let $d(a,b)$ denote the edit distance between strings $a$ and $b$, which is the minimum number of editing operations needed to transform $a$ into $b$. The allowed editing operations are as follows:
 add one character
 remove one character
 change one character
For example, $d(\texttt{AABA},\texttt{CAA})=2$, because we can remove the $\texttt{B}$ letter and change the first $\texttt{A}$ letter.
Given three strings $a$, $b$ and $c$, your task is to find a string $x$ such that $d(x,a)+d(x,b)+d(x,c)$ is minimum.
Input
There are three lines that contain the strings $a$, $b$ and $c$. Each string consists of characters $\texttt{A} \ldots \texttt{Z}$.
Output
Print a string $x$ that consists of characters $\texttt{A} \ldots \texttt{Z}$ and minimizes the edit distance. If there are several such strings, print any of them.
Constraints
 $1 \le a, b, c \le 50$
Example
Input:
ABBA
AYBABTU
BASTU
Output:
ABABTU