block.py

import subprocess
import os
while(1):
    r=subprocess.check_output(['who','-u'])
    s1=r.split("\n")
    for x in s1:
        s2=x.split("    ")
        if(len(s2[5])==18):
            s3=s2[5]
            s4=s3.split(" ")
            s5=s4[1]
            s6=s5.replace("(","")
            s6=s6.replace(")","")
            os.system("ssh user@"+s6)
            os.system("user12")
            r1=subprocess.check_output(['who','-u'])
            s33=r.split("\n")
            for y in s33:
                s34=y.split("    ")
                s35=s34[3]
                if s35[len(s35)-1]=="?":
                    s36=s34[5]
                    s37=s36.replace(" ","")
                    s38=s37[0:5]
                    os.system("kill "+s38)
                    os.system("exit")
                    break