#include<iostream>
#include<set>
#include<algorithm>
#include<cmath>
#include<cstdio>
 
#define REP(i,s,n) for(int i=s;i<n;i++)
#define rep(i,n) REP(i,0,n)
#define MAX 300001
 
using namespace std;
typedef unsigned long long ull;
int n,m,L,R;
char s[MAX],o[5];
set<ull> ans;
const ull B = 9973ULL;
const ull inv = 9063375710536127837ULL;
ull H,Bmax;
 
int main()
{
 cin.tie(0);
 ios::sync_with_stdio(false);

  Bmax = 1;
  L = R = 0;
  scanf("%d %d",&n,&m);
  scanf("%s",&s[0]);
  H = s[0];
 
  rep(_,m)
    {
      scanf("%s",&o[0]);
 
      if(o[0] == 'R')
	{
	  if(o[1] == '+')
	    {
	      R++;
	      Bmax *= B;
	      H = H + s[R]*Bmax; 
	    }
	  else
	    {
	      H = H - s[R]*Bmax;
	      Bmax = Bmax*inv;
	      R--;
	    }
	}
      else
	{
	  if(o[1] == '+')
	    {
	      H = (H-s[L])*inv;
	      Bmax *= inv;
	      L++;
	    }
	  else
	    {
	      L--;
	      H = H * B + s[L];
	      Bmax *= B;
	    }
	}
      ans.insert(H);
    } 
 
  cout << ans.size() << endl;
 
  return 0;
}