Sanalista

const readline = require('readline');
 
const input = readline.createInterface({
	input: process.stdin,
	output: process.stdout,
	terminal: false
});
 
let output = 0;
let inputAmount = 0;
let inputtedValues = 0;
let firstLine = true;
 
input.on('line', function (line) {
	if (firstLine) {
		inputAmount = parseInt(line);
		firstLine = false;
	} else {
		let characters = {};
		for (let i = 0; i < line.length; i++) {
			if (characters[line.charAt(i)] != undefined) {
				characters[line.charAt(i)]++;
			} else characters[line.charAt(i)] = 1;
		}
		let hasEven = true;
		Object.values(characters).forEach(val => {
			if (val % 2 != 0) hasEven = false;
		});
		if (hasEven) output++;
		inputtedValues++;
		if (inputtedValues == inputAmount) {
			console.log(output);
			process.exit(0);
		}
	}
});

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED