#include <cstdio>

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


int main(){
	char day[14];
	int count = 0;
	int ans = -1;
	for (int i = 0; i < 14; i++){
		scanf("%c", &day[i]);
	}

	for (int i = 0; i < 14; i++){
		if(day[i] == 'o') count = 1;
		for (int j = i; j < 14; j++){
			if (day[j] == 'o') count++;
			else break;
		}

		ans = max(ans, count);
	}

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

	return 0;
}