Cake

function cake(input) {
    index = 0;
    let width = Number(input[index]);
    index++;
    let length = Number(input[index]);
    index++;
    let cakePieces = width * length;
    while (cakePieces > 0) {
        let command = input[index];
        index++;
        if (command === "STOP") {
            console.log(`${cakePieces} pieces are left.`);
            break;
        }
        cakePieces -= Number([command]);

    }
    if (cakePieces <= 0) {
        let diff = Math.abs(cakePieces);
        console.log(`No more cake left! You need ${diff} pieces more.`);
    }
}