ABC029B - カキ

#include <cstdio>
#include <iostream>
#include <string>
using namespace std;

#define REP(i, n) for (int i = 0; i < (n); ++i)

int main(void) {
    int ans = 0;
    string s;

    REP(i, 12) {
        cin >> s;
        if (s.find('r') != string::npos) {
            ans++;
        }
    }

    printf ("%d\n", ans);
    return 0;
}