#include <stdio.h>

int main() {
	char c;
	int cnt = 0, max = 0, i;

	for (i = 0; i < 15; i++) {
		if ((c = getchar()) != '\n') {
			if (c == 'o') cnt++;
			else cnt = 0;
			if (max < cnt) max = cnt;
		}
	}

	printf("%d\n", max);

	return 0;
}