import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No203 {
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();
		String str2 = br.readLine();
		int count = 0;
		count = check(str, count);
		count = check(str2, count);
		System.out.println(count);
	}
	
	public static int check(String s, int n){
		int ans = n;
		char[] day = s.toCharArray();
		for(int i=0; i < 7; i++){
			if(day[i] == 'o') ans++;
			else ans = 0;
		}
		return ans;
	}
}