use strict;

# Read all the data from STDIN in the $buffer variable
my $buffer = do { local $/; <STDIN> };

#Do a subtitution.
$buffer =~s/essage/assage/sg;

# Put $buffer back in STDIN so our system call can read it.
# DOES NOT WORK.
print STDIN "$buffer";

# Call our second program.
unshift(ARGV,"printout.pl");
unshift(ARGV,"perl");
system @ARGV;