Using the string operations, functions and methods that we have learned so
far, write a program that will allow the user to type in line of text until
the user types in the phrase "The end" on a
line by itself. The program will replace every occurrence of the word
"is" with the word "was"
and count the number of changes made. This will require
you to replace the string "is " at the
beginning of a line, the string " is" at
the end of a line and " is " everywhere
else on the line.