Encryption and Decryption using Caesar cipher algorithm - System Security | Python3

a = input("Enter the msg: ")

key = int(input("Enter the key: "))

ct = []

pt = []

for i in a:

    if ord(i) >= 97 and ord(i) <= 122:

        d = (((ord(i) + key) - 97) % 26) + 97

        ct.append(chr(d))

    elif ord(i) >= 62 and ord(i) <= 90:

        d = (((ord(i) + key) - 62) % 26) + 62

        ct.append(chr(d))

    else:

        ct.append(i)

print("Encrypted Data")

str1 = ''.join(ct)

print(str1)

for i in ct:

    if ord(i) >= 97 and ord(i) <= 122:

        d = (((ord(i) - key) - 97) % 26) + 97

        pt.append(chr(d))

    elif ord(i) >= 62 and ord(i) <= 90:

        d = (((ord(i) - key) - 62) % 26) + 62

        pt.append(chr(d))

    else:

        pt.append(i)

print("Decrypted Data")

str2 = ''.join(pt)

print(str2)

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