import sys

def wrap_line(line, max_width):
    words = line.split()
    new_lines = []
    current_line = ""

    for word in words:
        if len(current_line) + len(word) + (1 if current_line else 0) <= max_width:
            current_line += (" " if current_line else "") + word
        else:
            new_lines.append(current_line)
            current_line = word
    if current_line:
        new_lines.append(current_line)

    return new_lines

def process_file_inplace(file_path, max_width=40):
    with open(file_path, 'r', encoding='utf-8') as infile:
        lines = infile.readlines()

    new_content = []
    for line in lines:
        wrapped = wrap_line(line.strip(), max_width)
        new_content.extend(wrapped)

    with open(file_path, 'w', encoding='utf-8') as outfile:
        for line in new_content:
            outfile.write(line + '\n')

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Использование: python wrap.py <имя_файла>")
        sys.exit(1)

    filename = sys.argv[1]
    process_file_inplace(filename, max_width=80)