Go For Basics

const readline = require("readline");
// readline ek library hoti hai. Input lene me help karti hai

const code = readline.createInterface({
input: process.stdin
});

const userInput = [];

code.on("line", (data) => {
userInput.push(data);
});

// neglect code above it
code.on("close", () => {
let marks = parseInt(userInput[0])

// write your code here

if(marks>90){
console.log("Exellent");
}
else if(marks<=90 && marks >=70){
console.log("Good");
}
else if(marks<=70& marks >=30){
console.log("Fair");
}
else{
console.log("Fail")
}});****