function solve(input = []) {
    let items = input.shift().split(', ');
    let commands = input.shift();

    while (commands !== 'Craft!') {
        let tokens = commands.split(' - ');
        let action = tokens[0];
        let item = tokens[1];
        let index = items.indexOf(item);

        switch (action) {
            case 'Collect':
                if (index < 0) {
                    items.push(item)
                }
                break;

            case 'Drop':
                if (index >= 0) {
                    items.splice(index, 1)
                }
                break;

            case 'Combine Items':
                let splitted = item.split(':');
                let old = splitted[0];
                let newItem = splitted[1];
                let newIndex = items.indexOf(old);
                if (newIndex >= 0) {
                    items.splice(items.indexOf(newIndex[old]), 0, newItem);
                }
            case 'Renew':
                if (index >= 0) {
                    items.push(item)
                    items.shift()
                }
        }
        commands = input.shift()
    }

    console.log(items.join(", "))

}

solve([
    'Iron, Sword',
    'Drop - Bronze',
    'Combine Items - Sword:Bow',
    'Renew - Iron',
    'Craft!'
])