package main

import "fmt"

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func main() {
	var s1, s2 string
	fmt.Scan(&s1, &s2)
	c := s1 + s2
	var h, maxh int
	for i := range c {
		if c[i] == 'o' {
			h++
			maxh = max(maxh, h)
		} else {
			h = 0
		}
	}
	fmt.Println(maxh)
}