function arrayModify(data) {
    let arr = data.shift().split(" ").map(Number);

    let index = 0;

    let command = data[index];
    index++;

    while (command !== "end") {
        let tokens = command.split(" ");
        let action = tokens[0];

        let indexOfFirstEl = Number(tokens[1]);
        let indexOfSecondEl = Number(tokens[2]);

        switch (action) {
            case "swap":
                let elementToReplace = arr[indexOfFirstEl];
                let replacedElement = arr[indexOfSecondEl];
                arr.splice(indexOfFirstEl, 1, replacedElement);
                arr.splice(indexOfSecondEl, 1, elementToReplace);
                break;
            case "multiply":
                arr[indexOfFirstEl] *= arr[indexOfSecondEl];
                break;
            case "decrease":
                arr = arr.map((element) => element - 1);
                break;
        }

        command = data[index];
        index++;
    }
    console.log(arr.join(", "));
}