with open('data.txt', 'r', encoding='utf-8') as f:
    lines = f.readlines()

processed_lines = [f"_{line.strip().upper()}_" for line in lines]

with open('output.txt', 'w', encoding='utf-8') as f:
    for line in processed_lines:
        f.write(line + '\n')

print("Данные успешно преобразованы в КУРСИВНЫЙ КАПС и записаны в output.txt")