const fs = require('fs');

const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');

const connections: { [key: string]: Array<string> }= {};

input.split("\n").forEach((conn: string) => {
    const [c1, c2] = conn.split('-');
    connections[c1] = [c2, ...(connections[c1] || [])]
    connections[c2] = [c1, ...(connections[c2] || [])]
});

let nets: Set<string> = new Set;

for (let key in connections) {
    const conns = connections[key];
    conns.forEach((c2) => {
        connections[c2].forEach((c3) => {
            if (connections[c3].includes(key)) {
                const arr = [key, c2, c3];
                arr.sort();
                nets.add(arr.join(','));
            }
        })
    });
}

while (nets.size > 1) {
    const nextNets: Set<string> = new Set;
    for (let net of nets) {
        const cps = net.split(',');
        for (let i in connections) {
            if (cps.includes(i)) {
                continue;
            }
            const conns = connections[i];
            if (cps.every((id) => conns.includes(id))) {
                const newNet = [...cps, i];
                newNet.sort();
                nextNets.add(newNet.join(','));
            }
        }
    }

    nets = nextNets;
}

console.log(nets);