abc29b.cpp

#include <iostream>
#include <string>
using namespace std;
int main(){
	string str;
	int count = 0;
	for (int i = 0; i < 12; i++){
		cin >> str;
		if (str.find("r") != -1)
			count++;
	}
	cout << count<< endl;
	return 0;
}