splitCaptcha

data = open("capthca.png","rb").read()
sig = "\x89PNG"
i = 0
n = 10000
while sig in data[i:]:
    i1 = data.index(sig,i)
    open(str(n)+".png","wb").write(data[i-len(sig):i1])
    n+=1
    i = i1+len(sig)

open(str(n)+".png","wb").write(data[i-len(sig):])