The reverse of [abc] is [cba].
The reverse of [abcd] is [dcba].
The reverse of [with spaces] is [secaps htiw].
The reverse of [ with spaces] is [secaps htiw ].
The reverse of [with spaces ] is [ secaps htiw].
The reverse of [abcdefghijklmnopqrstuvwxyz] is [zyxwvutsrqponmlkjihgfedcba].