const fs = require('fs');
const file = fs.readFileSync(__dirname + '/input.txt').toString('utf-8');
const groups = file.split('\n\n');

let total = 0;

groups.forEach(answers => {
    answers = answers
        .replace(/\n/g, '')
        .split('');
    
    let answered = {};
    answers.forEach(a => answered[a] = true);
    total += Object.keys(answered).length;
});

console.log(`Total: ${total}`);