#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <string>
#include <vector>
using namespace std;

vector<unsigned long long> pow_hash, hashes;
inline void rolling_hash(const string& s) {
	const int n = s.size();
	const unsigned long long base = 1000000007ull;
	pow_hash.clear();
	pow_hash.resize(n + 1);
	hashes.clear();
	hashes.resize(n + 1);

	pow_hash[0] = 1;
	hashes[0] = 0;

	for(int i = 0; i < n; ++i) {
		pow_hash[i + 1] = pow_hash[i] * base;
		hashes[i + 1] = hashes[i] * base + s[i];
	}
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n, m;
	cin >> n >> m;

	string str;
	cin >> str;

	rolling_hash(str);

	int l = 0, r = 1;
	vector<unsigned long long> str_hash;
	str_hash.reserve(m);
	for(int i = 0; i < m; ++i) {
		string ope;
		cin >> ope;

		if(ope == "R++")
			++r;

		else if(ope == "R--")
			--r;

		else if(ope == "L++")
			++l;

		else
			--l;

		str_hash.push_back(hashes[r] - hashes[l] * pow_hash[r - l]);
	}

	sort(str_hash.begin(), str_hash.end());
	cout << unique(str_hash.begin(), str_hash.end()) - str_hash.begin() << endl;

	return EXIT_SUCCESS;
}