def solution(arr1, arr2):
height = len(arr1)
width = len(arr2[0])
answer = []
for i in range(0, height):
row = []
line1 = arr1[i]
for j in range(0, width):
line2 = []
for k in range(len(arr2)):
line2.append(arr2[k][j])
# print(line2)
new_num = 0
for t in range(0, len(line1)):
new_num += line1[t]*line2[t]
row.append(new_num)
answer.append(row)
# print(answer)
return answer