HELP!!!!!

I'm submitting Problem 1190 in java and getting runtime error .. What's wrong with the code?? Here is my code ::

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

    Scanner in = new Scanner(System.in);

    int c = 0, c1 = 11, c2 = 11;

    char ch = in.next().charAt(0);

    double[][] arr = new double[12][12];

    for (int i = 0; i < 12; i++) {

       for (int j = 0; j < 12; j++) {

            arr[i][j] = in.nextDouble();

       }

    }

    double s = 0.0;

    for (int i = 1; i <= 10; i++) {

        for (int j = c1; j >= c2; j--) {

            s += arr[i][j];

            c++;

        }

        if (i<5) {

            c2--;

        }

        else if (i>5) {

            c2++;

        }

    }

    if (ch == 'S') {

        System.out.printf("%.1f\n", s);

    } else if(ch == 'M') {

        System.out.printf("%.1f\n", s / c);

    }

}

}