var input = require("fs").readFileSync("input.txt").toString();
var links = input.split("\n").filter((a)=>(a)).map((a)=>(a.split(" <-> ")[1].split(", ").map((b)=>(parseInt(b)))));
var allvisited = [];
function getconnected(x, items){
	if(items.indexOf(x) == -1){
		items.push(x);
		links[x].forEach((a)=>(getconnected(a, items)));
	}
	return items;
}
var i = 0;
while(allvisited.length != Object.keys(links).length){
	var start = Object.keys(links).map((a)=>(parseInt(a))).filter((a)=>(allvisited.indexOf(a) == -1))[0];
	console.log(i, start);
	var newgroup = getconnected(start, []);
	allvisited = allvisited.concat(newgroup);
	i++
}
console.log(i);