Description

Modify the previous program to work with command-line arguments instead of the standard input.

You need to put it in quotes to pass an argument that contains spaces as a single argument. So "Welcome to hyperskill!" becomes a single Welcome to hyperskill! argument without quotes. You need quotes to pass this argument, but you don't need to remove these quotes in the actual code!

Objectives

The program must parse three arguments: -mode, -key, and -data. The first argument should determine the program's mode (enc for encryption, dec for decryption). The second argument is an integer key to modify the message, and the third is a text or ciphertext to encrypt/decrypt.

Arguments are guaranteed to be passed to the program. If, for some reason, they turn out to be wrong:

1. If there is no -mode, the program should work in the enc mode;
2. If there is no -key, the program should consider that it is 0;
3. If there is no -data, the program should assume that data is an empty string.

Keep in mind that the order of the arguments might be different. For example, -mode enc maybe at the end, at the beginning, or in the middle of the array.

Examples

Example 1: encryption; the arguments are: -mode enc -key 5 -data "Welcome to hyperskill!"

\jqhtrj%yt%m~ujwxpnqq&

Example 2: decryption; the arguments are: -key 5 -data "\jqhtrj%yt%m~ujwxpnqq&" -mode dec

Welcome to hyperskill!