using System;
using System.Collections.Generic;
using System.Linq;

namespace contest_cs
{
    class Program
    {
        static void Main(string[] args)
        {
            var line = Console.ReadLine();
            var numS = line.Split(' ')
                .Where(it => it.StartsWith("S"))
                .Count();

            string ans;
            switch (numS) {
                case 0:
                    ans = "8/31";
                    break;

                case 1:
                    ans = "8/32";
                    break;

                case 2:
                    ans = "8/33";
                    break;

                default:
                    throw new InvalidOperationException();
            }

            Console.WriteLine(ans);
        }
    }
}