public class Solution {
    public static void main(String[] args) {
        int[][] M = {{1, 2, 3}, {2, 3, 4}, {1, 1, 1}};
        int[][] N = {{4, 5, 6}, {7, 8, 9}, {4, 5, 0}};
                
        for (int i = 0; i < M.length; i++) {
          for (int j = 0; j < M[i].length; j++) {
            System.out.println(M[i][j] - N[i][j]);
          }
        }
    }
}

a1 = [1,2,3]
a2 = [2,3,4]
a3 = [1,1,1]

matrix_a = [a1,a2,a3]

b1 = [4,5,6]
b2 = [7,8,9]
b3 = [4,5,0]

matrix_b = [b1,b2,b3]

c1 = []
c2 = []
c3 = []

matrix_c = [c1,c2,c3]



for n in range(len(matrix_a)):
  for i in range(len(matrix_a[n])):
    matrix_c[n].append(matrix_a[n][i] - matrix_b[n][i])



for n in range(len(matrix_c)):
  for i in range(len(matrix_c[n])):
    print(matrix_c[n][i])

-3
-3
-3
-5
-5
-5
-3
-4
1

-3
-3
-3
-5
-5
-5
-3
-4
1