while True:
low = 0
higth = float(raw_input("a:"))
guess = float((low + higth)/2)
x = higth
while guess**2 != x:
if guess**2 > x:
higth = guess
else:
low = guess
guess = (low +higth)/2
print guess
ch = str(raw_input("\'q\'is quit the program or any key to comtinue:"))
if ch == "q":
break


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