#include<stdio.h>
int main()
{
	char c[10];
	int ans = 0, x = 0, i;
	scanf("%s", c);
	for (i = 0; i < 7; i++)
	{
		if (c[i] == 'o')
			x++;
		else
			x = 0;
		if (ans < x)
			ans = x;
	}
	scanf("%s", c);
	for (i = 0; i < 7; i++)
	{
		if (c[i] == 'o')
			x++;
		else
			x = 0;
		if (ans < x)
			ans = x;
	}
	printf("%d\n", ans);
	return 0;
}