package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	var b = make([]byte, 0, 100)
	b = append(b, sc.Bytes()...)
	sc.Scan()
	b = append(b, sc.Bytes()...)
	str := string(b)
	var max, yy int
	t := 1
	for i := range str {
		if str[i] == 'o' {
			if yy == 1 {
				t++
			}
			if max < t {
				max = t
			}
			yy = 1
		} else {
			yy = 0
			t = 1
		}
	}
	fmt.Println(max)
}