def find_all_indexes2(input_str, search_str):
    indexes = []
    index = input_str.find(search_str)

    while index != -1:
        indexes.append(index)
        index = input_str.find(search_str, index+1)

    return indexes

print(find_all_indexes2("Can you can a can as a canner can can a can", "can"))
# returns [8, 14, 23, 30, 34, 40]
# Note: Capital "Can" was not found