# -*- coding: iso-8859-1 -*-
# mk, 31.8.08

# Programm enthält bewusst einen Fehler!

from math import sqrt

def quadglei(a,b,c):  
    if a==0:
        if b==0:
            if c==0:
                return [3]
            else:
                return [0]
        else:
            x = float(-c)/b
            return [1,x]
    else:
        d = b*b-4*a*c
        if d>0:
            wd = sqrt(d)
            x1 = (-b-wd)/float(2*a)
            x2 = (-b+wd)/float(2*a)
            return [2,x1,x2]
        else:
            if d==0:
                x = -b/float(2*a)
                return [1,x]
            else:
                return [0]

print 'a*x²+b*x+c=0\n'

a = input('a = ')
b = input('b = ')
c = input('c = ')

L = quadglei(a,b,c)
fall = L[0]
if fall == 0:
    print '\nL = {};'
elif fall == 1:
    print '\nL = {'+str(-c/b)+'};'
elif fall == 2:
    print '\nL = {'+str(L[1])+','+str(L[2])+'};'
elif fall == 3:
    print '\nL = IR;'