Introduction - If you have any usage issues, please Google them yourself
This time we complete a simple encryption program on the letter. First letter number and the lowercase letters a to z No. 1-26, the uppercase letters A to Z are numbered 27-52, so that each letter has a unique serial number when sending content, we function F (X) = X* X+ X+1 is calculated to send the serial number of the letters will get a new serial number, the serial number and then the remainder of 52, you want to send the serial number is encrypted the serial number of the letters, so you can reach encrypted.