A generalization of the Ceaser cipher known as the affine cipher
has the following form: For each plaintext Letter p, substitute the
cipher text Letter C:
C= (k1*P +K2 ) mode 26
A ciphertext has been generated with an affine cipher. The most
frequent letter of the ciphertext is ‘F’, and the second most
frequent letter of the ciphertext is ‘N’. Break this code.