def solution(arr1, arr2):
answer = []
for i in range(len(arr1)):
result = []
for j in range(len(arr2[0])):
_sum = 0
for k in range(len(arr1[i])):
num_a = arr1[i][k]
num_b = arr2[k][j]
_sum += num_a * num_b
result.append(_sum)
answer.append(result)
return answer