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  1. or download this
    @array = ("12G","1G30G","13G24G");
map { $cntr++ if /G/ } @array;
print "$cntr\n";
  2. or download this
    @array = ("12G","1G30G","13G24G");
for (@array) {
   $cntr++ if /G/;
}
print "$cntr\n";
  3. or download this
    @array = ("12G","1G30G","13G24G");
$str = join '', @array;
$str =~ s/[^G]//g;
print length($str), "\n";