using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string input = "We have 23 students at Cybernetics, 32 students at Computer Science and we also have 12 teachers";

        var words = input.Split(' ');

        int studentCount = 0;

        for(int i=0; i<words.Length; i++)

        {

            string word = words[i];

            int nr;

            if(int.TryParse(word, out nr))

            {

                if(i+1 < words.Length && words[i+1] == "students") studentCount+=nr;

            }

        }

        Console.WriteLine("Students " + studentCount);

    }

}