@array = ("12G","1G30G","13G24G");
map { $cntr++ if /G/ } @array;
print "$cntr\n";

##</code><code>##

@array = ("12G","1G30G","13G24G");
for (@array) {
   $cntr++ if /G/;
}
print "$cntr\n";

##</code><code>##

@array = ("12G","1G30G","13G24G");
$str = join '', @array;
$str =~ s/[^G]//g;
print length($str), "\n";