#include <iostream>
#include <cstdio>
using namespace std;
// 曼哈顿距离：条件——需要找距某中心在某个距离内的坐标
int main(){
    double sum = 0,count = 0,a,x = 5.5,y = 0;
    char c;
    cin >> c;
    for (int i = 0; i < 12;i++){
        for (int j = 0;j < 12;j++){
            cin >> a;
            if (abs(i-x)+abs(j-y) <= 4.5){
                count ++;
                sum +=a;
            }
        }
    }
    printf("%.1lf",c == 'S'? sum:sum/count);
    return 0;
}

// 数组
int main(){
    double sum = 0,count = 0;
    double M[15][15];
    char c;
    cin >> c;
    for (int i = 0; i < 12;i++){
        for (int j = 0;j < 12;j++){
            cin >> M[i][j];
        }
    }
    int x = 0;
    for (int i = 1;i < 11;i++){
        for (int j = 0;j <= x; j++){
            count++;
            sum += M[i][j];
        }
        if (i < 5) x++;
        else if (i == 5) continue;
        else x--;
    }
    printf("%.1lf",c == 'S'? sum:sum/count);
    return 0;
}
// 无数组
int main(){
    double sum = 0,count = 0,a;
    char c;
    cin >> c;
    for (int i = 0; i < 12;i++){
        for (int j = 0;j < 12;j++){
            cin >> a;
            if (i > j && j + i < 11) {
                count ++;
                sum += a;
            }
        }
    }
    printf("%.1lf",c == 'S'? sum:sum/count);
    return 0;
}