昨天美团输入输出搞晕，感觉已跪，自己写了一个，给的测试样例是对的，想请求下楼主有没有什么问题，总觉得很繁琐。

/**
 * Created by eleven on 2017/8/31.
 */
var readline = require('readline');

var rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

var lines = [];
var n,m;
var links = [],linkeds = [];

rl.on('line', function(line){
    lines.push(line);

    if (lines.length === 1){
        n = parseInt(lines[0]);
    }

    if(lines.length === n+1){
        for(var i = 1; i < n + 1; i++){
            links.push(lines[i]);
        }
    }

    if(lines.length === n+2){
        m = parseInt(lines[n+1]);
    }

    if(lines.length === n+m+2){
        for(var j = n + 1; j < n+m+2; j++){
            linkeds.push(lines[j]);
        }

        for(var k = 0; k < linkeds.length; k++){
            var index =links.indexOf(linkeds[k]);
            if(index > -1){
                links.splice(index,1);
            }
        }

        links.sort();
        for(var p =0; p < links.length; p++){
            console.log(links[p]);
        }
    }
});

rl.on('close', function() {
    process.exit(0);
});