function solve() {
    return function (selector) {
        var template = [
          '<div class="events-calendar">',
            '<h2 class="header">',
                  'Appointments for <span class="month">{{data.month}}</span> <span class="year">{{data.year}}</span>',
              '</h2>',
            '{{#each data.days}}',
              '<div class="col-date">',
                  '<div class="date">{{day}}</div>',
                  '<div class="events">',
                    '{{#each events}}',
                      '{{#if title}}',
                      '<div class="event {{importance}}" title="{{comment}}">',
                          '<div class="title">{{title}}</div>',
                          '<span class="time">at: {{time}}</span>',
                      '</div>',
                      '{{else}}',
                        '<div class="event none">',
                        '<div class="title">Free slot</div>',
                        '</div>',
                      '{{/if}}',
                    '{{/each}}',
                 '</div>',
                '</div>',
              '{{/each}}',
          '</div>'
        ].join('\n');
        document.getElementById(selector).innerHTML = template;
    };
}