import java.util.Scanner;
class BinaryAdd{
	static String complement(String str){
		String s1 = "";
		for(int i = 0; i < 8; i++)
			if(str.charAt(i) == '1') s1 += "0";
			else s1 += "1";
		return s1;
	}
	static String appendZeros(String str){
		for(int i = 8 - str.length(); i != 0; i--) str = "0" + str;
		return str;
	}
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter an 16-bit binary number: ");
		String data = sc.next();     
		int n1 = Integer.parseInt(data.substring(0,8), 2);
		int n2 = Integer.parseInt(data.substring(8), 2);
		String sum = appendZeros(Integer.toBinaryString(n1 + n2));
		String toSend = data + complement(sum);
		System.out.println(toSend +" is being sent(data+checksum).");
		n1 = Integer.parseInt(toSend.substring(0,8), 2);
		n2 = Integer.parseInt(toSend.substring(8, 16), 2);
		int n3 = Integer.parseInt(toSend.substring(16), 2);
		sum = appendZeros(Integer.toBinaryString(n1 + n2 + n3));
		if(complement(sum).equals("00000000")) System.out.println("Success.");
		else System.out.println("Failed.");
	}
}