def reduce_precision(input_file, output_file):
    with open(input_file, "r") as infile, open(output_file, "w") as outfile:
        for line in infile:
            line = line.strip()
            if line:  # skip empty lines
                try:
                    num = float(line)
                    if num.is_integer():
                        outfile.write(f"{int(num)}\n")
                    else:
                        outfile.write(f"{num:.3f}\n")
                except ValueError:
                    # If not a number, write unchanged
                    outfile.write(line + "\n")

if __name__ == "__main__":
    input_path = "data.txt"      # original file
    output_path = "data2.txt" # new file
    reduce_precision(input_path, output_path)