Question: Assume plaintext is converted to ciphertext using a Vigen re cipher with a key length of 3 . Assume that in the resulting ciphertext, there

Assume plaintext is converted to ciphertext using a Vigenre cipher with a key length of 3. Assume that in the resulting ciphertext, there are 15 distinct characters that occur (not counting characters that occur multiple times). What is the minimum number of distinct characters that could have appeared in the original plaintext?
Enter your answer as an integer.

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