import math
import decimal

def main():
    a, b, c = input().split()
    a = decimal.Decimal(a)
    b = decimal.Decimal(b)
    c = decimal.Decimal(c)
    
    if a < 0:
        a, b, c = -a, -b, -c

    if a == 0 and b == 0:
        if c == 0:
            print(-1, end='\n')
        else:
            print(0, end='\n')
        return

    if a == 0:
        print(1, end='\n')
        print(-c / b, end='\n')
        return

    t = decimal.Decimal(b * b - 4 * a * c)
    if t < 0:
        print(0, end='\n')
        return
    elif t == 0:
        print(1, end='\n')
        print(-b / decimal.Decimal(2 * a), end='\n')
        return

    t = t.sqrt()
    print(2, end='\n')
    print((-b - t) / decimal.Decimal(2 * a), end='\n')
    print((-b + t) / decimal.Decimal(2 * a), end='\n')

if __name__ == '__main__':
    main()