import cProfile
# def lights(): return["".join(["-" if (len(set(x for x in range(1,buttonNo + 1) if lightNo%x == 0))%2 == 0) else "*" for lightNo in range(1,51)]) for buttonNo in range(1,51)]
# def xlights(): return["".join(["-" if (len(set(x for x in xrange(1,buttonNo + 1) if lightNo%x == 0))%2 == 0) else "*" for lightNo in xrange(1,51)]) for buttonNo in xrange(1,51)]

# print cProfile.run('lights()')
# print cProfile.run('xlights()')

def iain():
    output = "-" * 50
    for x in range(1,51):
        output = "".join([output[i-1] if (i%x!=0) else "-" if output[i-1] == "*" else "*" for i in xrange(1,51)])
        print output
def dan():
    output = list("-" * 50)
    for x in xrange(1,51):
        for i in xrange(1,51):
            if i % x == 0:
                output[i-1] = "*" if output[i-1] == "-" else "-"
        print "".join(output)

def last():
    return["".join(["*" if (50 >= x and float(x**.5).is_integer()) else "-" for x in xrange(1,51)])]

def testIain():
    for i in xrange(100):
        iain()

def testDan():
    for i in xrange(100):
        dan()

def testLast():
    for i in xrange(100):
        last()

cProfile.run('testDan()')
cProfile.run('testIain()')
# cProfile.run('testLast()')