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Program: Vigenère cipher (on alphabet string)

In this program, you are required to implement the Vigenère cipher algorithm from scratch, to encrypt and decrypt for alphabet string. The encrypt and decrypt method should be pure functions, i.e. without side effects.

Your program does the following:

• Read an alphabet string from the console input, where the string is only consisting of 26 uppercase letters (A-Z). The first string represents the plaintext.
• Read the second alphabet string. It is ensured that the length of second alphabet string is the same with the first string. The second string represents the key.
• Encrypt the plaintext with the key.
• Print the ciphertext alphabet string.
• Decrypt the ciphertext with the key.

Example Input & Output

Input:

ABCDEFG
ABC
1