Write a program called alphamirror that takes a string as argument and displays this string after replacing each alphabetical character with the opposite alphabetical character.
The case of the letter remains unchanged, for example :
'a' becomes 'z', 'Z' becomes 'A' 'd' becomes 'w', 'M' becomes 'N'
The final result will be followed by a newline ('\n').
If the number of arguments is different from 1, the program displays nothing.
$ go run . "abc"
zyx
$ go run . "My horse is Amazing." | cat -e
Nb slihv rh Znzarmt.$
$ go run .
$