package main

import (
	"fmt"
)

func main() {
	var a, b string
	fmt.Scanf("%s %s", &a, &b)

	p := 0
	ans := 0
	for _, c := range a + b {
		if c == 'o' {
			p++
			if p > ans {
				ans = p
			}
		} else {
			p = 0
		}
	}
	fmt.Println(ans)
}