#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "math.h"
#include "utility"
#include "string"
#include "map"
#include "unordered_map"
#include "iomanip"
#include "random"

using namespace std;
const long long int MOD = 1000000007;

int i[3000000];
int j[3000000];

long long int N;
string s[100001];
int si[100001];
long long int M, x, d;
long long int ans;

int main() {
	ios::sync_with_stdio(false);
	cin >> N;
	for (int i = 1; i <= N; i++) {
		cin >> s[i];
		si[i] = (int)s[i].size();
	}
	cin >> M >> x >> d;
	for (int k = 0; k < M; k++) {
		i[k] = (x / (N - 1)) + 1;
		j[k] = (x % (N - 1)) + 1;
		if (i[k] > j[k]) {
			swap(i[k], j[k]);
		}
		else {
			j[k] = j[k] + 1;
		}
		x = (x + d) % (N * (N - 1));
	}
	for (int k = 0; k < M; k++) {
		for (int l = 0; l < min(si[i[k]], si[j[k]]);l++) {
			if (s[i[k]][l] != s[j[k]][l]) {
				ans += l;
				break;
			}
		}
	}
	cout << ans << endl;
	return 0;
}