import java.util.Scanner;
public class No203 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String inputData = sc.next() + sc.next();
		sc.close();
		int renkyu = 1;
		int renkyuMax = 0;
		for(int i = 0; i < 13; i++){
			if(inputData.charAt(i) == 'o' && inputData.charAt(i) == inputData.charAt(i + 1)){
				renkyu++;
				if(renkyu > renkyuMax){
					renkyuMax = renkyu;
				}
			}else{
				renkyu = 1;
			}
		}
		System.out.println(renkyuMax);
	}
}