# use strict;
# use warnings;

chomp(my $S = <>);
my $n = 1;
my $l = length($S);
if ($l > 3) {
    $S =~ /c+/;
    my $c = $+[0];
    my $w = $l - $c;
    $n = $c <= $w ? $c - 1 : $w;
}
print($n, "\n");