import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashSet;
import java.util.Vector;

public class bingo {
    public static void main(String[] args) throws IOException {
    	FileReader f = new FileReader("bingo.in");
    	BufferedReader b = new BufferedReader(f);
    	
    	HashSet m = new HashSet();
    	//Vector m = new Vector();
    	String s;
    	int wSum = 0;
    	int count = 0;
    	while((s = b.readLine()) != null) {
    		String[] words = s.split("[^a-zA-Z]");
    		for(int i = 0; i < words.length; i++) {
    			words[i] = words[i].toLowerCase();
    			if(words[i].equals("bullshit")) {
    				//System.out.println("count:" + m.size());
    				wSum += m.size();
    				count++;
    				m.clear();
    			} 
    			else if (words[i].length() > 0 && !m.contains(words[i])) {
//    				//System.out.println("word:" + words[i]);
    				m.add(words[i]);
    			}
    		}
    	}
    	//System.out.println(wSum + "/" + count);
    	for(int i = 2; i <= count; i++) {
    		if((count % i == 0) && (wSum % i == 0)) {
    			count = count / i;
    			wSum = wSum / i;
    		}
    	}
    	System.out.println(wSum + " / " + count);
	}
}