发送电报保密是一项重要的工作，尤其是在军事领域，所以，为了安全的需要常常会对发送的内容进行加密，然后，接收方再进行解密，这样就达到了安全的需要。字母a，序号是1，加密后的序号为2，此时，加密后输出的字母应该c；-The send telegram confidentiality is an important job, especially in the military field, and the need for security often be sent encrypted, then the recipient to decrypt reached the security needs. Letters a, the number is 1, the encrypted number is 2, then, the encrypted output letters should c