with open('data.txt','r') as file:
    lines = file.readlines()
sorted_lines = []
for line in lines:
    sorted_line=' '.join(sorted(line.split(), key=int))
    sorted_lines.append(sorted_line)

with open('output.txt', 'w') as file:
    for sorted_line in sorted_lines:
        file.write(sorted_line + '\n')