import pandas as pd

input_file = 'data.txt'
input_data = pd.read_csv(input_file)

input_data['item'] = input_data['item'].str.upper()

input_data = input_data.sort_values(by='price')

output_file = 'output.txt'
input_data.to_csv(output_file, index=False)

print('Data processing complete!')