function shoppingList(arr) {

    let groceries = arr.shift().split('!');
    let shoppingList = groceries;
    let i = 0;
    while (arr[i] !== "Go Shopping!") {
        let tokens = arr[i].split(' ');
        let command = tokens[0]; // команди
        let index1 = tokens[1];
        if (command === "Urgent") {
            if (shoppingList.includes(index1)) {

            } else {
                shoppingList.unshift(index1);
            }
        } else if (command === "Unnecessary") {
            if (shoppingList.includes(index1)) {
                let indexOfItem = arr.indexOf(index1);
                shoppingList.splice(indexOfItem, 1);
            }
        } else if (command === "Correct") {
            if (shoppingList.includes(index1)) {
                let indexOfItem = arr.indexOf(index1);
                let index2 = tokens[2];
                shoppingList.splice(indexOfItem, 1, index2);
            }
        } else if (command === "Rearrange") {
            if (shoppingList.includes(index1)) {
                let indexOfItem = arr.indexOf(index1);
                shoppingList.splice(indexOfItem, 1);
                shoppingList.push(index1);
            }
        }
        i++;
    }
    console.log(shoppingList.join(', '))

}