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+## returna
+
+### Instructions
+
+Write a program that takes a `string` as an argument, if the `string` contains the letter `a` then print `Contains the letter` followed by a newline `\n`.
+
+- If there is no character `a` in the `string`, the program writes `!(Contains the letter)` followed by a newline `\n`.
+- If the number of parameters is not 1, the program displays a newline `\n`.
+
+### Usage
+
+```console
+$ go run . "do I exist" | cat -e
+!(Contains the letter)$
+$
+$ go run . "I do exist a" | cat -e
+Contains the letter$
+$
+$ go run . "one" "two" | cat -e
+$
+```