import java.io.*;


public class text {
	public static void main(String[] args) throws IOException{
		BufferedReader f = new BufferedReader(new FileReader("text.in"));
		PrintWriter out = new PrintWriter(new FileWriter("text.out"));
		
		String line;
		String[] lines = new String[100];
		int i = 0;
		
		while( (line = f.readLine()) !=  null){
		//	System.out.println("linie noua");
	//		System.out.println(line);
			lines[i++] = line;
		}
		String[] p;
		int nrOfLines = 0, nrOfText = 0;
		for (int j = 0;j< lines.length;j++){
			if(lines[j] != null){
				p = lines[j].split(" ");
				nrOfLines += p.length;
				nrOfText += lines[j].length();
			//	System.out.println(p.length);
			}
			
		}
	//	System.out.println(lp);
		out.write(nrOfText/nrOfLines);
		f.close();
	}
}