List prices$\_$list is created with the first three prices read from input. Then, new$\_$price is initialized with the last price read from input. Update the second element in prices$\_$list with new$\_$price.

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Ex: If the input is:

$$18\mathrm{.}75$

$$13\mathrm{.}25$

$$11\mathrm{.}75$

$$25\mathrm{.}25$

then the output is:

$$25\mathrm{.}25$ is at index $1$ of $[\text{'}$ $$18\mathrm{.}7\text{'},\text{'}$ $${25\mathrm{.}25}^{\text{'}},{?}^{\text{'}}$$${11\mathrm{.}75}^{\text{'}}]$