A$\mathrm{.}22$ Let $A$ be the language containing only the single string $s,$ where

$s=\{\begin{array}{ccc}0& if\text{l}\text{i}\text{f}\text{e}\text{n}\text{e}\text{v}\text{e}\text{r}\text{w}\text{i}\text{l}\text{l}be\text{f}\text{o}\text{u}\text{n}\text{d}on\text{M}\text{a}\text{r}\text{s}\text{.}& \\ 1& if\text{l}\text{i}\text{f}\text{e}\text{w}\text{i}\text{l}\text{l}be\text{f}\text{o}\text{u}\text{n}\text{d}on\text{M}\text{a}\text{r}\text{s}\text{s}\text{o}\text{m}\text{e}\text{d}\text{a}\text{y}\text{.}& \end{array}$

Is A decidable? Why or why not? For the purposes of this problem, assume that

the question of whether life will be found on Mars has an unambiguous YES or NO

answer.