function solve(input=[]){
let existingCards = input.shift();
let deck = []

for (let iterator of input) {
    if (iterator === "Ready") {
        console.log(deck.join(" "));

        break;
    } else {
        if (iterator.includes("Add")) {
            let [add, addCardName] = iterator.split(" ")
            if (existingCards.includes(addCardName)) {
                deck.push(addCardName)
            } else {
                console.log("Card not found.");
            }
        } else if (iterator.includes("Insert")) {
            let [insert, insertCardName, index] = iterator.split(" ")
            if (existingCards.includes(insertCardName) && index >=0 && index < existingCards.length) {
                deck.splice(index, 0, insertCardName)
            } else {
                console.log("Error!");

            }
        } else if (iterator.includes("Remove")) {
            let [remove, removeCardName] = iterator.split(" ")
            if (deck.includes(removeCardName)) {
                let removeIndex = deck.indexOf(removeCardName)
                deck.splice(removeIndex, 1)
            } else {
                console.log("Card not found.");
            }
        } else if (iterator.includes("Swap")) {
            let [swap, cardName1, cardName2] = iterator.split(" ")
            if (deck.includes(cardName1) && deck.includes(cardName2)) {
                let card1Index = deck.indexOf(cardName1);
                let card2Index = deck.indexOf(cardName2);
                deck.splice(card1Index, 1, cardName2)
                deck.splice(card2Index, 1, cardName1)
            }
        } else if (iterator.includes("Shuffle")) {
            deck.reverse();
        }
    }
}
}