baekjoon 1100 하얀 칸 ] 문자열처리

import java.util.*;
import java.io.*;

public class Main {

    public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String[] str = new String[9];
            int result = 0;

            for(int i = 0; i < 8; i++) {
                str[i] = sc.nextLine();
                if( i % 2 == 0 ) for (int j = 1; j < 5; j++) if(str[i].charAt(2*j-2) == 'F') result++;
                if( i % 2 == 1 ) for (int j = 1; j < 5; j++) if(str[i].charAt(2*j-1) == 'F') result++;
            }
            System.out.println(result);
    }
}