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">{{this.day}}</div>
                    <div class="events">
                        {{#each this.events}}
                        {{#if this.title}}
                        <div class="event {{this.importance}}" title={{this.comment}}>
                            <div class="title">{{this.title}}</div>
                            <span class="time">at: {{this.time}}</span>
                        </div>
                        {{else}}
                        <div class="event none">
                            <div class="title">Free slot</div>
                        </div>
                        {{/if}}
                        {{/each}}
                    </div>
                </div>
                {{/each}}
            </div>
        `;
        document.getElementById(selector).innerHTML = template;
    };
}