A pangram is a sentence that uses every letter of a given alphabet.
Write a program that will receive various sentences as arguments and print
those that are valid pangrams, meaning they use all letters from a-z, case
ARGV is available via STDIN, joined on NULL. x is a no-op.
arguments holds ARGV, print() to output with a newline,
write() to output without a newline.
say() is available without any import.
$args to access the arguments.
SELECT arg FROM argv
to access the arguments, only the first
column of the first result set will be printed, NULL values will be
skipped, and the dialect is SQLite