function processData(input) {
    const arrStartIndex = input.lastIndexOf('\n');
    const finalArr = input.substring(arrStartIndex + 1).split(' ');
    const sortedArr = finalArr.sort((a, b) => a - b);
    const middleNumber = (sortedArr.length / 2)
    const secondHalf = sortedArr.slice(middleNumber)
    const firstHalf = sortedArr.slice(0, middleNumber)
    const result= [...firstHalf, ...secondHalf.reverse()].join(' ')
    return result;
}