import csv

input_file = 'input.csv'
output_file = 'output.csv'

with open(input_file, 'r') as infile, open(output_file, 'w', newline='') as outfile:
    reader = csv.reader(infile)
    writer = csv.writer(outfile)
    
    header = next(reader)  # Skip header

    for i, row in enumerate(reader):
        if i >= 1000:  # Stop after 10000 rows
            break
        writer.writerow([row[0]])