# for all upper case letters.
a= "       Welcome to Computer"
print(a.upper())

# for all lower case letters 
print(a.lower())

# for removing befor and after exter space.
print(a.strip())

# for replacing the word form a string.
print(a.replace("Computer","Home"))

# for spliting the sting form a word
# the "...." contain the string that is used to slipt the big string.
b=a.split("to")
print(b)
print(a.split("to"))