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

transformed_lines = [line.upper() for line in lines]

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

print("Файл output.txt успешно создан!")