RE200_CSAW

def bin2char(bin_text):
    return ''.join(chr(int(bin_text[i:i+8], 2)) for i in xrange(0, len(bin_text), 8))
def char2bin(c):
    return bin(ord(c))[2:].zfill(8)
def RCL(c):
    _bin = list(char2bin(c))
    cf = _bin[0]
    for i in xrange(0,7):
        _bin[i] = _bin[i+1]
    _bin[7] =cf
    return bin2char("".join(_bin))
def RCR(c):
    _bin = list(char2bin(c))
    cf = _bin[7]
    for i in xrange(7,0,-1):
        _bin[i] = _bin[i-1]
    _bin[0] =cf
    return bin2char("".join(_bin))
def xor(a,b):
    return chr(ord(a)^ord(b))
def sumstr(a,b):
    return chr((ord(a)+ord(b))&0xff)
def check(x3B,a,x1,x2):
    # x2 = _9576
    # x1 = _955E
    a = RCL(a)
    a = RCL(a)
    a = RCL(a)
    stack = a
    a = x3B
    a = RCR(a)
    a = RCR(a)
    x3B = a
    a = stack
    a = sumstr(a,x3B)
    a = xor(a,x1)
    x3B = a
    a = RCL(a)
    a = RCL(a)
    a = RCL(a)
    a = RCL(a)
    if a==x2:
        global _3B
        _3B = x3B
        return True
    return False

_955E = list("703053A1D3703F64B316E4045F3AEE42B1A137156E882AAB".decode("hex"))
_9576 = list("20AC7A25D79CC21D58D01325966ADC7E2EB4B410CB1DC266".decode("hex"))

charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
input = ""
_3B = "\x00"
flag = ""
for i in xrange(0x18):
    for c in charset:
        if check(_3B,c,_955E[i],_9576[i]):
            print i,c
            flag += c
            break
print flag
# flag{NOHACK4UXWRATHOFKFUHRERX}