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;
my $min = 100;

while($instr =~ /([c][^c]*?[w][^w]*?[w])(.*)/ ) {
	my $d_len = length("$1");
	$len = $d_len if( $d_len < $min );
	$instr = "$2";
}

print $len;