How to get incoming data for a nodejs task on Yandex.cup?

Question

Yandex

They write in the condition - standard input-output

Readline () works on codeforces, not here.
Tried

process.stdin.on('data', function (data) {
  const inputData = data
});

But data does not contain a string (I can’t understand what exactly is contained, some object, not an array, testing possibilities are limited)

How to get incoming data?