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.

[EX Q]: Many people contend - and prove - that it's more costly to execute a man or to keep a man on deathrow than it would be to keep him in prison for life.
[EX A]: Valid

[EX Q]: First, i'm curious to know why you call having sex "indulging", as I really don't see how sex has to do with "indulging".
[EX A]: Invalid

[EX Q]: Yes I think it is fine to use taxes to keep pedophiles in jail.
[EX A]:
Invalid