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## nbrconvertalpha
### Instructions
Write a **program** that prints the corresponding letter in the `n` position of the latin alphabet, where `n` is each argument received.
For example `1` matches `a`, `2` matches `b`, etc. If `n` does not match a valid position of the alphabet or if the argument is not an integer, the **program** should print a space (" ").
A flag `--upper` should be implemented. When used the program prints the result in upper case. The flag will always be the first argument.
### Usage
```console
student@ubuntu:~/student/test$ go build
student@ubuntu:~/student/test$ ./nbrconvertalpha | cat -e
$
student@ubuntu:~/student/test$ ./nbrconvertalpha 8 5 12 12 15 | cat -e
hello$
student@ubuntu:~/student/test$ ./nbrconvertalpha 12 5 7 5 14 56 4 1 18 25 | cat -e
legen dary$
student@ubuntu:~/student/test$ ./nbrconvertalpha 32 86 h | cat -e
$
student@ubuntu:~/student/test$ ./nbrconvertalpha --upper 8 5 25 | cat -e
HEY$
```