#include <string>
#include <iostream>
 
void cbc_encrypt(char iv, char key, const char* text, std::size_t size, char* buf)
{
	while (size--)
	{
		*buf = iv ^ (key ^ *text++);
		iv = *buf++;
	}
}
 
void cbc_decrypt(char iv, char key, const char* text, std::size_t size, char* buf)
{
	while (size--)
	{
		*buf++ = iv ^ (key ^ *text);
		iv = *text++;
	}
}
 
int main()
{
	std::string msg;
 
	while (std::getline(std::cin, msg))
	{
		std::string enc(msg.size(), char());
		cbc_encrypt('a', 'k', msg.data(), msg.size(), &enc[0]);
		cbc_decrypt('a', 'k', enc.data(), enc.size(), &msg[0]);
 
		std::cout << "Encrypted: " << enc << '\n';
		std::cout << "Decrypted: " << msg << '\n';
	}
}

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