import java.io.*;

public class Main {
	public static void main(String[] args) throws IOException{
		BufferedReader f = new BufferedReader(new FileReader("text.in"));
		PrintWriter out = new PrintWriter("text.out","UTF-8");
		
		String line, copy;
		String[] lines = new String[100];
		int i = 0;
		
		while( (line = f.readLine()) !=  null){
			lines[i++] = line;
		}
		
		String[] p;
		int nrOfLines = 0, nrOfText = 0, code;
		
		for (int j = 0;j< lines.length;j++){
			if(lines[j] != null){
				p = lines[j].split(" ");
				nrOfLines += p.length;
				for(int k = 0; k < p.length;k++){
					copy = p[k];
					for (int l = 0 ;l <copy.length(); l++){
						code = (int)copy.charAt(l);
						if(code >= 65 && code <= 122)
							nrOfText ++;
					}
				}
			}
			
		}
		out.print(nrOfText/nrOfLines);
		f.close();
		out.close();
	}
}