I need help with the following program for a Programming Languages class. This should be done in Lex. Write a Lex input file that will produce a program that counts characters, words, and lines in a text file and reports the counts. Define a word to be any sequence of letters and/or digits, without punctuation or spaces. Punctuation and white space do not count as words. A sample output of the program is given:

Number of characters: 35747

Number of words: 5978

Number of lines: 1506