import math
a,b,c = map(int,input().split())	
if a == 0 and b == 0 and c == 0:
    print(-1)
elif b * b - 4 * a * c < 0:
    print(0)
elif b * b - 4 * a * c == 0:
    print(1)
    print(-b/(2.0 * a))
else:
    d = math.sqrt(1000000000000000000000000000000 * (b * b - 4 * a * c))
    e = -b * 1000000000000000
    f = 2 * a * 1000000000000000
    print(2)
    print('{:.20g}'.format((e - d) / f))
    print('{:.20g}'.format((e + d) / f))