Add a function SubString()which takes a string, a starting index and an ending index as parameters and returns a substring consisting of elements between those indices. python code example

Example: how to get any letter of a string python

Random = "Whatever"#you can put anything here
words2 = Random.split(" ")
print('number of letters:')#you can delete this line...
print(len(Random))#and this one. these lines just Tell you how many 
#letters there are
while True:#you can get rid of this loop if you want
    ask = int(input("what letter do you want?"))
    print(Random[ask-1])