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

print $len;