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
        .split('\n');
    
    let answered = {};
    answers.forEach( an => an.split('').forEach(a => answered[a] ? answered[a]++ : answered[a] = 1 ));
    
    for (const [key, value] of Object.entries(answered)) {
        if (value == answers.length) total++;
    }
});

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