Arithmetic operations in morse code :

• plus = .-.-.
• multiply = -..-
• minus = -....-
• divide = -..-.

Numbers in morse code :

• 0 = -----
• 1 = .----
• 2 = ..---
• 3 = ...--
• 4 = ....-
• 5 = .....
• 6 = -....
• 7 = --...
• 8 = ---..
• 9 = ----.

For example, if you wanted to calculate 1 + 9 using this program, you would write: .---- .-.-. ----.

The result, which is of course 10, will look like this: .---------

And suppose you made a mistake by entering the equation by entering 9 incorrectly like this : .---- .-.-. ---- The result :

Error line = 1 column = 12 : token recognition error at: '----'
Error line = 1 column = 16 : mismatched input '<EOF>' expecting {'-----', '.----', '..---', '...--', '....-', '.....', '-....', '--...', '---..', '----.'}