def translate_variable(variable_number: int) -> str:
	"""
	Get variable name from its number

	Variable numbers represent the index in the following sequence:
	```
	Y, X1, Z1, X2, Z2, X3, Z3, ...
	```
	"""
	# return "Y" if the number is 1
	if variable_number == 1:
		return "Y"
	# X if even index, Z if odd index
	letter = "X" if variable_number % 2 == 0 else "Z"
	# index number of the variable
	number = variable_number // 2
	# return the variable name
	return letter + str(number)