There is a file with a list of numbers.
Example:

**AK
  v       0.00o      0.00       0.00       0.00       0.00       0.00       0.00
        750.00       0.00       0.00       0.00       0.00       0.00       0.00
        750.00      43.00       0.00       0.00       0.00       0.00       0.00
        585.00      43.00      -7.00       0.00       0.00       0.00       0.00
   -16611181.71     -90.16t     -7.00       0.00       0.00       0.00       0.00
        585.00      57.00       0.00       0.00       0.00       0.00       0.00
        750.00      57.00       0.00       0.00       0.00       0.00       0.00
        750.00     100.00       0.00       0.00       0.00       0.00       0.00
          0.00     100.00       0.00       0.00       0.00       0.00       0.00
          0.00      56.99       0.00       0.00       0.00       0.00       0.00
        165.00      56.99      -7.00       0.00       0.00       0.00       0.00
   16612362.17     344.30t     -7.00       0.00       0.00       0.00       0.00
        165.00      42.99       0.00       0.00       0.00       0.00       0.00
          0.00      42.99       0.00       0.00       0.00       0.00       0.00
          0.00       0.00       0.00       0.00       0.00       0.00       0.00**

You need to remove the entire line from it, where the number > 12000 or the number < -12000.
I tried to split the string into substrings and compare the value, but nothing worked 🙁

for line in infile:
    if line.startswith('   '):
        str = line.split()
        numbers = int(str[0])

    if not (numbers < 12000) or not (numbers > -12000):
        outfile.write(line)