A string is collected then each element of the string is turned into a value in a dictionary while its key is its index.

String Dictionary

string = input('Please type in a string.')

if type(string) != str:
    string = input('That is not a string! Please type a string.')
else:
    strindex = range(len(string))
    strlist = []
    for letter in string:
        strlist.append(letter)
    stringdict = dict(zip(strindex, strlist))
    print (stringdict)