http://arc001.contest.atcoder.jp/tasks/arc001_1

arc001_01.js

process.stdin.resume();
process.stdin.setEncoding('utf8');
 
process.stdin.on('data', function (chunk) {
    var answers = {'1':0,'2':0,'3':0,'4':0};
    var lines = chunk.toString().split('\n');
    var len = parseInt(lines.shift(),10);

    lines.toString().trim().split('').slice(0,len)
        .forEach(function(v){
            answers[v]++;
        });

    var result = (function(o){
        var max = 0;
        var min = len;
        for (var key in o) {
            min = Math.min(o[key],min);
            max = Math.max(o[key],max);           
        }
        return [max,min];
    }(answers));

    console.log(result.join(" "));
 
 });