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;

sub chk{
	my $d_len = length($_[0]) ;
	$min = $d_len if( $d_len < $min );
}

&chk("$1") while($instr =~ /([c][^c]*?[w][^cw]*?[w])/g );
if( $min == 100 ) {&chk("$1") while($instr =~ /([c][^c]*?[w][^w]*?[w])/g )};

print ( $min==100 ? $len : $min);