using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Light_the_Torches
{
    class Program
    {
        static void Main()
        {
            int rooms = int.Parse(Console.ReadLine());
            char[] basement = new char[rooms];
            char[] roomsLight = Console.ReadLine().ToArray();
            int index = 0;
            int start = (rooms / 2) ;
            int prays = 0;
            for (int i = 0; i < basement.Length; i++)
            {
                basement[i] = roomsLight[index];
                if (index == roomsLight.Length - 1)
                {
                    index = 0;
                }
                else index++;


            }
            while (true)
            {
                string input = Console.ReadLine();
                if (input == "END")
                {
                    break;
                }
                string[] inputComb = input.Split(' ');
                int step = int.Parse(inputComb[1]);
                string direction = inputComb[0];
                if (direction=="LEFT")
                {
                    if (start - (step + 1) < 0)
                    {
                        start = 0;
                    }
                    else start = start - (step + 1);
                    if (basement[start] == 'L')
                    {
                        basement[start] = 'D';
                    }
                    else basement[start] = 'L';
                }
                if (direction == "RIGHT")
                {
                    if (start + (step + 1) > basement.Length-1)
                    {
                        start = basement.Length - 1;
                    }
                    else start = start + (step + 1);
                    if (basement[start] == 'L')
                    {
                        basement[start] = 'D';
                    }
                    else basement[start] = 'L';
                }
            }
            prays = (basement.Count(x=>x=='D')) * (int)'D';
            Console.WriteLine(prays);
        }
    }
}