Coulumb's Law for small spheres

Two small, identical spheres, one positively charged and other negatively charged, when placed 0.5m apart, they attract each other with a force of 0.108N. If they are brought in contact for some time and again separated by 0.5m, they repel each other with a force of 0.036N. What were the initial charges on the spheres?

Details and Assumptions:

Coulumb's Constant k= 9 * 10^{9}

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