#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cctype>
#include <sstream>
#include <map>

using namespace std;
typedef vector<int> vi;
typedef map<string, int> ms;

int gcd(int a, int b) {
	int r = 1;
	int min = (a<b)?a:b;
	for(int i=1; i<=min; i++)
		if(a%i==0 && b%i==0)
			r = i;
	
	return r;
/*	if (a==b) {
		 return 1;
	} else {
		if(a < b) {
			return gcd(b-a, b);
		} else {
			return gcd(a-b, a);
		}
	} */
}


int main () {
	fstream fin("bingo.in");
	stringstream ss;
	vi games;
	ms words;
	string s;
	char ch;
	while (fin.get(ch)) ss.put(ch);
	s = ss.str();
	for(unsigned int i=0; i < s.size(); i++) {
		if(!isalpha(s[i])) {
			s[i] = ' ';
			continue;
		} else {
			s[i] = tolower(s[i]);
		}
	}
	stringstream ns(s);
	int currwords = 0;
	while(ns >> s) {
		if(s == "bullshit") {
			words.clear();
			games.push_back(currwords);
			currwords = 0;
		} else {
			if(words.find(s)==words.end()) {
//				cout << "adding \"" << s << "\", currwords is " << currwords << endl
				words[s] == 1;
				currwords++;
			}
		} 
	}
	int g = games.size();
//	cout << games.size() << endl;
	int i = 0;
	for(int j=0; j < g; j++) {
		i += games[j];
	}
	
	cout << (i/gcd(i,g)) << " / " << (g/gcd(i,g)) << endl;

	return 0;
}