The term letter of the alphabet is identified in base64 scheme by the sequence bGV0dGVyIG9mIHRoZSBhbHBoYWJldA==, while the MD5 signature is equal to 72329bf4bcce44822b44fd373a76d0a5. The ASCII encoding of letter of the alphabet in hexadecimal notation is 6c6574746572206f662074686520616c706861626574.