function solve(arr = []) {
    let tasks = arr.shift().split(' ').map(Number);
    for (let iterator of arr) {
        if (iterator === 'End') {
            break;
        }
        let [command, index, time] = iterator.split(' ');
        if (command === 'Complete') {
            complete(+index);
        }
        if (command === 'Change') {
            change(+index, +time);
        }
        if (command === 'Drop') {
            drop(+index);
        }
        if (command === 'Count') {
            if (index === 'Completed') {
                console.log(tasks.filter(t => t === 0).length);
            } else if (index === 'Incomplete') {
                console.log(tasks.filter(t => t > 0).length);
            } else if (index === 'Dropped') {
                console.log(tasks.filter(t => t < 0).length);
            }
        }
    }
    function complete(index) {
        if (index >= 0 && index < tasks.length) {
            tasks[index] = 0;
        }
    }
    function change(index, time) {
        if (index >= 0 && index < tasks.length) {
            tasks[index] = time;
        }
    }
    function drop(index) {
        if (index >= 0 && index < tasks.length) {
            tasks[index] = -1;
        }
    }
    console.log(tasks.filter(t => t > 0).join(' '));
}
solve([`1 -1 2 3 4 5`,
    `Complete 4`,
    `Change 0 4`,
    `Drop 3`,
    `Count Dropped`,
    `End`
    ])


solve([`1 2 3 4 5 4 0 3 2 1`,
    `Complete 0`,
    `Complete 1`,
    `Complete 2`,
    `Drop 3`,
    `Change 4 1`,
    `Count Completed`,
    `End`
    ])