\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[croatian]{babel}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usetikzlibrary{plotmarks}
\title{Matplotlib2tikz}
\author{Ivica Nakić}
\begin{document}
\maketitle\thispagestyle{empty}
\begin{center}
\input{graf.tikz}
\end{center}
\end{document}