Added A1Z26 Cipher

ciphers/a1z26.py

@@ -0,0 +1,29 @@
+"""
+Convert a string of characters to a sequence of numbers
+corresponding to the character's position in the alphabet.
+
+https://www.dcode.fr/letter-number-cipher
+http://bestcodes.weebly.com/a1z26.html
+"""
+
+def encode(plain: str) -> list:
+    """
+    >>> encode("myname")
+    [13, 25, 14, 1, 13, 5]
+    """
+    return [ord(elem) - 96 for elem in plain]
+
+def decode(encoded: list) -> str:
+    """
+    >>> decode([13, 25, 14, 1, 13, 5])
+    'myname'
+    """
+    return "".join(chr(elem + 96) for elem in encoded)
+
+def main():
+    encoded = encode(input("->").strip().lower())
+    print("Encoded: ", encoded)
+    print("Decoded:", decode(encoded))
+
+if __name__ == "__main__":
+    main()