Write a Python program to add two given lists of different lengths, start from left

def elementswise_left_join(l1, l2):
    f_len = len(l1)-(len(l2) - 1)
    for i in range(0, len(l2), 1):
        if f_len - i >= len(l1):
            break
        else:
            l1[i] = l1[i] + l2[i]
    return l1

nums1 = [2, 4, 7, 0, 5, 8]
nums2 = [3, 3, -1, 7]
print("\nOriginal lists:")
print(nums1)
print(nums2)
print("\nAdd said two lists from left:")
print(elementswise_left_join(nums1,nums2))

nums3 = [1, 2, 3, 4, 5, 6]
nums4 = [2, 4, -3]
print("\nOriginal lists:")
print(nums3)
print(nums4)
print("\nAdd said two lists from left:")
print(elementswise_left_join(nums3,nums4))