Find The GCDs in matrix's Column

import java.util.ArrayList;
import java.util.Scanner;

public class A3Q1 {

    public static int GCD(int a, int b) {
        while (b != 0) {
            int tem = a % b;
            a = b;
            b = tem;
        }
        return a;
    }
    public static int GCDS(int[] numbers){
        int count = 0;
        for (int i = 2; i < numbers.length; i++) {
            count = GCD(GCD(numbers[i - 2], numbers[i - 1]), numbers[i]);
            if(count == 1){
                break;
            }
        }
        return count;
    }

    public static void main(String[] args) {
//        int[] test = {2,2,2};
//        GCDS(test);
        Scanner in = new Scanner(System.in);
        int index = 0;
        int NumofMatrix = Integer.parseInt(args[index]);
        index++;
        ArrayList output = new ArrayList();
        for(int NumberofMatrix = 1; NumberofMatrix <= NumofMatrix; NumberofMatrix++){
            //Get the matrix
            int rows = Integer.parseInt(args[index]);
            index++;
            int columns = Integer.parseInt(args[index]);
            index++;
            int[][] matrix = new int[rows][columns];
            for(int i = 0; i < rows; i++){
                for(int j = 0; j < columns; j++){
                    matrix[i][j] = Integer.parseInt(args[index]);
                    index++;
                }
            }
            for(int j = 0; j < columns; j++){
                int[] OneColumn = new int[rows];
                int indexx = 0;
                for(int i = 0; i <rows; i++){
                    OneColumn[indexx] = matrix[i][j];
                    indexx++;
                }
                output.add(GCDS(OneColumn));
                if(j == columns-1){
                    output.add(-1);
                    break;
                }
            }
        }
        for(int target = 0; target < output.size(); target++){
            if(output.toArray()[target].equals(-1)){
                System.out.print("\n");
                continue;
            }
            System.out.print(output.toArray()[target]);
        }
    }
}