    # Program to add two matrices using nested loop
     
    X = [[12,7,3],
        [4 ,5,6],
        [7 ,8,9]]
     
    Y = [[5,8,1],
        [6,7,3],
        [4,5,9]]
     
    result = [[0,0,0],
             [0,0,0],
             [0,0,0]]
     
    # iterate through rows
    for i in range(len(X)):
       # iterate through columns
       for j in range(len(X[0])):
           result[i][j] = X[i][j] + Y[i][j]
     
    for r in result:
       print(r)