According to Newton's 3rd law, the force that the Earth exert on the Sun would be equal (and in opposite direction) with the force that the Sun exerts on the Earth.
Also Newton's gravitational law states the formula for the attraction between objects with mass, is the same for both objects
Newton's law of universal gravitation states that "any two objects A and B exert a gravitational force of attraction on each other and the magnitude of this force is proportional to the product of the masses of the objects and inversely proportional to the square of the distance separating these objects".
This means that two objects interacting together will exert the same force of gravity (or simply gravitational force) on each other. Though the masses of the two objects may be different, the magnitude of the force that one object exerts on the other is still the product of these masses and the inverse of the square of the distance between them.
Therefore, the gravitational force that the Sun, though of higher mass than the Earth, will exert on the Earth is the same as that which the Earth will exert on the Sun.
