We would like you to assess the QUALITY of each of the following argument (discussing Death Penalty) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of death penalty. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of death penalty.

Example Input: Like i said, it it takes more than opinion to make me believe something so prove it not by opinions but by sources that supports the point you are making in relation to the same studies.
Example Output: Invalid

Example Input: No letting the family or friends of the victim kill the convicted person might be childish revenge.
Example Output: Valid

Example Input: If you're attacked, you're guilty if you fight back and cause either harm or fear to the person attacking you.
Example Output:
Invalid