use strict;
use warnings;

use utf8;
use Encode qw/encode decode decode_utf8 encode_utf8 from_to/;


my $instr = decode('utf8', <STDIN>);
my $len = -1;

while($instr =~ /([Cc].*?[wW].*?[Ww])(.*)/ ) {
	$len = length("$1");
	$instr = "$2";
}

print $len;