$7\mathrm{.}3\mathrm{.}1$: String methods.

$568844\mathrm{.}4228274.$qx$3$zqy$7$

String letters is read from input. If $\text{'}$e$\text{'}$ is in letters, then:

Output 'Found at index: $\text{'}$ followed by the index of the last occurrence.

Create a string from letters with the first two occurrences of $\text{'}$e$\text{'}$ replaced by $\text{'}($erased$)\text{'}$ and output letters on a newline.

Otherwise, output 'Not found'.

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