pragyan-MI6.py

#!/usr/bin/python

import sys
import string

# k = [int(z) for z in "26 25 30 28 22 25 20 23 21 29 22 24 26 23 21 26 27 20 28 22 25 23 30 29 23 28 24 20 21 26 25 20 23 27 23 29 25 22 23 26 27 29 24 23 30 21 25 24 26 20 24 22 21 30 26 20 25 24 21 23 27 29 26 22 20 21 23 22 30 26 29 26 28 27 22 20 27 29 26 30 28 27 26 23 29 21 22 25 27 24 21 29 25 24 20 25 23 22 30 28 27 29 25 20 24 21 23 20 23 21 29 26".split(" ")]
k = [26, 29, 21, 23, 20, 23, 21, 24, 20, 25, 29, 27, 28, 30, 22, 23, 25, 20, 24,     25, 29, 21, 24, 27, 25, 22, 21, 29, 23, 26, 27, 28, 30, 26, 29, 27, 20, 22,     27, 28, 26, 29, 26, 30, 22, 23, 21, 20, 22, 26, 29, 27, 23, 21, 24, 25, 20,     26, 30, 21, 22, 24]
# k.reverse()
currentNum = 0
lastNum = 0
outString = "PRAGYANCTF{"
while True:
  if currentNum == 0:
    x = raw_input(" %s > " % outString).rstrip()
  else:
    x = raw_input(" %s [%d][%c] > " % (outString,currentNum,chr(currentNum ^ 61))).rstrip()
  if x == "g":
    lastNum = k.pop()
    currentNum += lastNum
  elif x == "p":
    currentNum -= lastNum
    k.append(lastNum)
    lastNum = 0
  elif x == "s":
    outString += chr(currentNum ^ 61)
    currentNum = 0
  elif x == "d":
    print outString
    print k
  else:
    print "g : get another number"
    print "p : push a number back onto the stack"
    print "s : save a character"
    print "d : print debug"

# print k.pop()
# print k.pop()