package yukicoder;

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

public class Main {
	public static void main(String[] args) {
		BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
		try {
			String line = read.readLine() + read.readLine();

			int max = 0;
			int count = 0;
			for (int i = 0; i < line.length(); ++i) {
				if (line.charAt(i) == 'o') {
					++count;
					if (max < count) {
						max = count;
					}
				} else {
					count = 0;
				}
			}

			System.out.println(max);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}