#include <stdio.h>
#include <string.h>

#define WEEK_LENGTH 8 
#define MAX_LENGTH 16

int main(void)
{
//string関数の練習も兼ねてあえてこういう記述
	char all_day[MAX_LENGTH];
	char week_1[WEEK_LENGTH];
	char week_2[WEEK_LENGTH];
	int streak = 0;
	int i;

	scanf("%s", week_1);
	scanf("%s", week_2);

	strcpy(all_day, week_1);
	strcat(all_day, week_2);
	
	int tmp = 0;
	for ( i = 0; i < 14; i++ ) {
		if ( all_day[i] == 'o' ) {
			tmp++;
			if ( streak <= tmp ) {
				streak = tmp;
			}
		} else {
			tmp = 0;
		}
	}
	printf("%d\n", streak);
	return 0;
}