Program $1$:Write a program to accept a sentence which may be terminated by either $.,?$ or $!$ only. Any other character may be ignored. The words may be separated by more than one blank space and are in uppercase. Perform the following tasks: $($a$)$ Accept the sentence and reduce all the extra blank space between two words to a single blank space. $($b$)$ Accept a word from the user which is a part of the sentence along with its position number and delete the word and display the sentence.