More than two choices

1const input = require("fs").readFileSync(0, "utf8").trim().split(/\s+/);
2let pos = 0;
3const next = () => input[pos++];
4 
5const marks = Number(next());
6if (marks >= 90) {
7  console.log("A");
8} else if (marks >= 75) {
9  console.log("B");
10} else if (marks >= 40) {
11  console.log("C");
12} else {
13  console.log("Fail");
14}