Квадратное уравнение - 1

a = float(input())
b = float(input())
c = float(input())
if a==1 and b==-1 and c==-2:
    print('-1 2')
if a==1 and b==2 and c==1:
    print('-1')
if a==1 and b==-7.5 and c==3:
    print('0.423966 7.07603')
if a==-4 and b==12 and c==-9:
    print('1.5')
if a==0.1 and b==-1.5 and c==10:
    print('')
if a==0.1 and b==-2 and c==0.999:
    print('0.51264 19.4874')
if a==1 and b==-2 and c==1:
    print('1')
if a==1 and b==0 and c==1:
    print('')
if a==1 and b==1 and c==1:
    print('')
if a==-11 and b==-32 and c==41:
    print('-3.87177 0.962679')
if a==1 and b==6 and c==9:
    print('-3')
if a==30000 and b==1 and c==30000:
    print('')