#include <stdio.h>

int main(void) {
	int i;
	int d, dmax;
	char w1[8], w2[8], w[15];
	scanf("%s", w1);
	scanf("%s", w2);
	i = 0;
	while(i < 7){
		w[i] = w1[i];
		i++;
	}
	while(i < 14){
		w[i] = w2[i - 7];
		i++;
	}
	w[i] = '\0';
	
	dmax = 0;
	d = 0;
	i = 0;
	while(i < 14){
		if(w[i] == 'o'){
			d++;
			if(d > dmax)dmax = d;
		}
		else d = 0;
		i++;
	}
	//printf("%s\n", w);
	printf("%d\n", dmax);	
	return 0;
}