import java.util.*;

class No0203{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		str = str + sc.next();
		int res = 0;
		int temp = 0;
		for(int i = 0; i < str.length(); i++){
			if(str.charAt(i) == 'o'){
				for(int j = i; j < str.length(); j++){
					if(str.charAt(j) != 'o'){
						break;
					}
					temp++;
				}
				if(temp > res){
					res = temp;
					i = i + temp - 1;
				}
				temp = 0;
			}
		}
		System.out.println(res);
	}
}