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