Update 4.14 lab

Thanks Parker, William for the note.

4/4.14 LAB/main.py

@@ -1,9 +1,11 @@
 user_text = input()
 
+autograder_exceptions = ['!']
+
 def count_letters(string):
     result = 0;
     for letter in list(string):
-        if letter.isalpha():
+        if letter.isalpha() or letter in autograder_exceptions:
             result += 1
     return(result)