function activationKey(input) {
    let rawKey = input.shift();

    for (let line of input) {
        if (line === "Generate") {
            break;
        }
        let command = line.split(">>>");
        let token = command[0];

        switch (token) {
            case "Slice": {
                let startIndex = Number(command[1]);
                let endIndex = Number(command[2]);
            rawKey=rawKey.substring(0,startIndex)+rawKey.substring(endIndex)

                console.log(rawKey)
            }
                break;
            case "Flip": {
                let mpt = ""
                let upOrLow = command[1];
                let startIndex = Number(command[2]);
                let endIndex = Number(command[3]);
                let buff = rawKey.substring(startIndex, endIndex)
                if (upOrLow === "Upper") {
                    mpt = rawKey.substring(startIndex, endIndex).toUpperCase();
                    rawKey = rawKey.replace(buff, mpt);
                    console.log(rawKey)
                } else if(upOrLow === "Lower") {
                    mpt = rawKey.substring(startIndex, endIndex).toLowerCase();
                    rawKey = rawKey.replace(buff, mpt);
                    console.log(rawKey)
                }
            }
                break;
            case "Contains": {
                let substring = command[1];
                if (rawKey.includes(substring)) {
                    console.log(`${rawKey} contains ${substring}`);
                } else {
                    console.log("Substring not found!");
                }
            }
                break;

        }
    }

    console.log(`Your activation key is: ${rawKey}`);

}