/* Apologies for using C, but its my "mother-tongue" :P */

#include <stdio.h>

int main(int argc, char **argv)
{
    int ;
    for(i = (strlen(argv[1]) - 1); i >= 0; i--){
        printf("%c", *(argv[1] + i)); /* reverse a string, a number, a sentence, a novel... */
    }
}