def solution(numbers):
    answer = ''
    temp = []
    for number in numbers:
        number = str(number)*4 + str(len(str(number)))
        temp.append(number)
    s_numbers = sorted(temp)

    for s_number in reversed(s_numbers):
        ln = int(s_number[-1])
        s_number = s_number[:ln]
        answer += s_number
        
    if int(answer) == 0:
        answer = '0'
    return answerced[k])
    return answer