import java.util.Scanner;

class No_203 {
	public static void main(String args[]) {
		int day_streek = 0;
		int max = 0;
		Scanner stdIn = new Scanner(System.in);
		String week = stdIn.nextLine();	
		String[] day = week.split("");
		for (int i = 0; i < 14; i++) {
			if ( day[i].equals("o")) {
				day_streek++;	
			} else {
				if ( day_streek > max ) {
					max = day_streek;
				}
				day_streek = 0;
			}
		}
		if ( day_streek > max ) {
			max = day_streek;
		}
		System.out.println(max);
	}
}