my_string = "hello world"
for letter in my_string:
    print(letter)
    print(len(my_string))
    print(my_string[7])
    print(my_string[-3])
    print(my_string[2:7])
    print(my_string[2:])
    print(my_string[:7])
    print(my_string[:])
    print(my_string.index["Y"])