a = [1, 2,3], [2, 3,4],[1,1,1]
b = [4, 5,6], [7, 8,9],[4,5,7]
res = 0 
for i in range(3):
    for j in range(3):
            for k in range(3):
                    res += a[i][k]*b[k][j]           
            print(res)
            res = 0