#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const unsigned P = 1000000007U;

struct RollingHash {
	int n;
	vector<unsigned long long> pow, phash;
	RollingHash() {};
	template<typename T>
	RollingHash(const T& s, unsigned long long Q = 1) {
		n = s.size();
		pow.resize(n + 1); phash.resize(n + 1);
		pow[0] = Q; phash[0] = 0;
		for(int i = 0; i < n; i++) {
			pow[i + 1] = pow[i] * P;
			phash[i + 1] = s[i] + phash[i] * P;
		}
	}
	unsigned long long get(int i) const { return phash[i]; }
	unsigned long long get(int i, int j) const { return get(j) - get(i) * pow[j - i]; }
};

RollingHash h[100000];
string s[100000];

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

	ll N, M, x, d;
	cin >> N;
	for(int i = 0; i < N; i++) {
		cin >> s[i];
		h[i] = RollingHash(s[i]);
	}
	cin >> M >> x >> d;

	ll ans = 0;
	for(int k = 0; k < M; k++) {
		int i = (x / (N - 1)) + 1;
		int j = (x % (N - 1)) + 1;
		if(i > j) swap(i, j);
		else j++;
		x = (x + d) % (N * (N - 1));
		//cerr << "i : " << i << ", j : " << j << endl;
		i--, j--;
		int ok = 0, ng = min(s[i].size(), s[j].size()) + 1;
		while(abs(ok - ng) > 1) {
			int mid = (ok + ng) / 2;
			if(h[i].get(0, mid) == h[j].get(0, mid)) ok = mid;
			else ng = mid;
		}
		//cerr << "ok : " << ok << endl;
		ans += ok;
	}
	cout << ans << endl;
}