#include <cstdio>

int max(int a, int b){
	return a > b ? a : b;
}


int main(){
	char day[15];
	int count = 0;
	int ans = -1;
	scanf("%s", &day[0]);
	scanf("%s", &day[7]);

	for (int i = 0; i < 15; i++){
		if (day[i] == 'o') {
			count++;
		}
		else {
			ans = max(ans, count);
			count = 0;
		}
	}

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

	return 0;
}