package main

import (
	"fmt"
	"regexp"
	"strings"
)

func main() {
	var s, s1, s2 string
	var max int
	r := regexp.MustCompile("o+")

	fmt.Scanf("%s\n%s\n", &s1, &s2)
	s = strings.Join([]string{s1, s2}, "")

	for _, v := range r.FindAllStringSubmatch(s, -1) {
		if len(v[0]) > max {
			max = len(v[0])
		}
	}
	fmt.Println(max)
}