#!/usr/bin/evn perl

use strict;
use warnings;

my $c1 = <>;
my $c2 = <>;
chomp $c1;
chomp $c2;
my @array1 = split //, $c1;
my @array2 = split //, $c2;
push(@array1, @array2);

my $count = 0;
my $ans = 0;
for(my $i = 0; $i < $#array1 + 1; $i++) {
	if($array1[$i] eq 'o') {
		$count++;
	} else {
		$count = 0;
	}
	if($ans < $count) {
		$ans = $count;
	}
}
print "$ans\n";

exit;