One of the most basic problems in information processing is
identifying differences between data. This is useful when
comparing files, for example. For this problem, write a program
which identifies the differences between pairs of strings to
make it easier for humans to see the differences.
Your program should identify those characters which differ
between the two given strings in a visually striking way.
Output the two input strings on two lines, and then identify
the differences on the line below using periods (for identical
characters) and asterisks (for differing characters). For
The first line of input contains an integer $1 \le n \le 500$, indicating the
number of test cases that follow. Each test case is a pair of
lines of the same length, $1$ to $50$ characters. Each string contains
only letters (a-z, A-Z) or digits ($0$-$9$).
For each test case, output the two lines in the order they
appear in the input. Output a third line indicating
similarities and differences as described above. Finally,
output a blank line after each test case.
|Sample Input 1
||Sample Output 1