Assignment name  : aff_a
Expected files   : aff_a.c
Allowed functions: write
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Write a program that takes a string, and displays the first 'a' character it
encounters in it, followed by a newline. If there are no 'a' characters in the
string, the program just writes a newline. If the number of parameters is not
1, the program displays 'a' followed by a newline.

Example:

$> ./aff_a "abc" | cat -e
a$
$> ./aff_a "RaInB0w d4Sh!" | cat -e
a$
$> ./aff_a "ThE Ck3 Is L|3" | cat -e
$
$> ./aff_a | cat -e
a$