import java.util.Scanner;
public class No203 {
	public static void main(String[] args) {
		int renkyu = 0;
		int renkyuMax = 0;
		Scanner sc = new Scanner(System.in);
		for(int i = 0; i < 14; i++){
			String c = sc.next();
			if(c.equals("o")){
				renkyu++;
				if(renkyu > renkyuMax){
					renkyuMax = renkyu;
				}
			}else{
				renkyu = 0;
			}
		}
		System.out.println(renkyuMax);
	}
}