Question: In a long string of a ciphertext which was encrypted by an affinemap on a single letter message units in the 2 6 - letter

In a long string of a ciphertext which was encrypted by an affinemap on a single letter message units in the 26-letter alphabet,you observe that the most frequently occurring letters are Yand V, in that order.Assuming that those ciphertext message units are theencryption of E and T respectively.
1. What is the key a and b?
2. Encipher the plaintext messae " YES".

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