from __future__ import print_function
def f(x):
    return x**0.5

def wykres(a, b, func):
    for y in xrange(b, 0, -1):
        for x in xrange(a):
            if abs(y-func(x))<0.5:
                print ('*', end='')
            else:
                print (' ', end='')
        print ('')
wykres(20, 10, f)