Consider the string str1 = "Global Warming".

Write statements in Python to implement the following:

(a) To display the last four characters.

(b) To replace all the occurrences of letter 'a' in the string with "*".

What will be the output of the following code?

Text = "Mind@Work!" 
ln = len(Text)
nText = ""
for i in range(0, ln):
    if Text[i].isupper():
        nText = nText + Text[i].lower()
    elif Text[i].isalpha(): 
        nText = nText + Text[i].upper() 
else: 
    nText = nText + 'A'
print(nText)

Write a program to convert a string with more than one word into titlecase string where string is passed as parameter. (Titlecase means that the first letter of each word is capitalized.)

Write a program that takes a sentence as an input parameter where each word in the sentence is separated by a space. The function should replace each blank with a hyphen and then return the modified sentence.