fix check character is letter

src/functions.py

@@ -46,7 +46,7 @@ def displaySentence(sentence):
         initFile(f_dataStream, sentence)
 
         for char in sentence:
-            if (ord(char) > ord('A') and ord(char) < ord('Z')) or char == "?" or char == "!" or char == " " :
+            if (ord(char) >= ord('A') and ord(char) <= ord('Z')) or char == "?" or char == "!" or char == " " :
                 displayCharacter(f_dataStream, char)
             else:
-                print("Error, not a character")
+                print("Error, '{}' not a character".format(char))