C :

#include <stdio.h>
#include <string.h>
int main(void)
{
	char str[80];
//	char ch,ch1;
	char *p;
	gets(str);
	while( (strcmp(str,"!"))!=0)
	{
		p = str;
		while(*p)
		{
			if(*p >= 'a' && *p <= 'm')
			{
				putchar( *p + 25 - 2*(*p-'a'));
			}
			else if(*p >= 'n' && *p <= 'z')
			{
				putchar(*p - 25 + 2*('z'- *p));
			}
			else if(*p >= 'A' && *p <= 'M')
			{
// 				ch1 = 25 - (*p-'A');
// 				ch = *p + ch1 - (*p - 'A');
				putchar(*p + 25 - 2*(*p-'A'));
			}
			else if(*p >= 'N' && *p <= 'Z')
			{
				putchar(*p - 25 + 2*('Z'- *p));
			}
			else
			{
				putchar(*p);
			}
		
			p++;
		}
		putchar('\n');
		gets(str);
	}
	return 0;
}

C++ :

#include <stdio.h>
#include <string.h>

char * StringInverted(char *str){
	int i=0;
	while(str[i]){
		if('a'<=str[i] && str[i]<='z'){
			str[i] = 'z'-str[i]+'a';
		}else if('A'<=str[i] && str[i]<='Z'){
			str[i] = 'Z'-str[i]+'A';
		}
		i++;
	}
	return str;
}

int main(){
	char str[100];
	while(gets(str), strcmp(str, "!")){
		puts(StringInverted(str));
	}

	return 0;
}

Pascal :

var st,sta:string;
    n,i:longint;
begin
  readln(st);
  while st<>'!' do
    begin
      n:=length(st);sta:='';
      for i:=1 to n do
         begin
            if st[i] in ['a'..'z'] then
                sta:=sta+chr(219-ord(st[i]))
              else
                if st[i] in ['A'..'Z'] then
                   sta:=sta+chr(155-ord(st[i]))
                 else
                    sta:=sta+st[i];
          end;
      writeln(sta);
      readln(st);
    end;
end.

Java :

import java.math.BigDecimal;
import java.util.*;

public class Main{
    public static void main(String[] args)throws  Exception {
        Scanner in = new Scanner(System.in);
        char a = 'a';
        char z = 'z';
        char A = 'A';
        char Z = 'Z';
       while (true) {
           String s = in.nextLine();
           if("!".equals(s)){
               return;
           }
           StringBuilder b = new StringBuilder();
           for (int i = 0; i < s.length(); i++) {
               String zm = s.charAt(i) + "";
               int t = (int) s.charAt(i);
               if (zm.matches("[a-z]")) {
                   b.append((char) ((int) z - ((int) t - (int) a)));
               } else if (zm.matches("[A-Z]")) {
                   b.append((char) ((int) Z - ((int) t - (int) A)));
               } else {
                   b.append(s.charAt(i));
               }
           }
           System.out.println(b.toString());
       }
    }
}