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## displaya
### Instructions
Write a program that takes a `string`, and displays the first `a` character it
encounters in it, followed by a newline(`'\n'`). If there are no `a` characters in the
string, the program just writes `a` followed by a newline(`'\n'`). If the number of parameters is not
1, the program displays an `a` followed by a newline(`'\n'`).
### Usage
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test "abc"
a
student@ubuntu:~/piscine/test$ ./test "bcvbvA"
a
student@ubuntu:~/piscine/test$ ./test "nbv"
a
student@ubuntu:~/piscine/test$
```