How to get the same result without including the readline library?

Question

Node.js

const readline = require("readline-sync");

function sum() {
    let a = +readline.question("Введите первое число: ");
    let b = +readline.question("Введите второе число: ");
    return(a + b);
}

console.log(sum());

Here is the code, I want the same thing to be displayed, only without connecting the library, if it’s not difficult, tell me what needs to be done for this