Python, here's a question!

While I was implementing the algorithm,

For example, a1 + b1 + c1 = d1 a2 + b2 + c2 = d2 ..... a10+b10+c10=d10

at the value of

Among values between d1 and d10, Pick four randomly.

You are about to change the value of a b c of the selected valueOnly

Assuming that the selected value is d(), we are having a hard time because we can't think of a way to know which of d1~d10 I'd appreciate your help!