#include <iostream>
#include <string>
#include <vector>
#include <utility>

int N;
std::vector<std::string> s;
std::vector<size_t> i, j;
int M;
size_t x, d;

int comp(std::string s1, std::string s2) {
    int d = 0;
    int l = std::min(s1.size(), s2.size());
    for (int k = 0; k < l; k++) {
        if (s1[k] != s2[k]) {
            break;
        }
        d++;
    }
    //std::cout << d << std::endl;
    return d;
}

int main() {
    size_t r = 0;
    std::cin >> N;
    s.resize(N);
    for (int k = 0; k < N; k++) {
        std::cin >> s[k];
    }
    std::cin >> M >> x >> d;
    i.resize(M);
    j.resize(M);
    for (int k = 0; k < M; k++) {
        i[k] = (x / (N - 1)) + 1;
        j[k] = (x % (N - 1)) + 1;
        if (i[k] > j[k]) {
            std::swap(i[k], j[k]);
        }
        else {
            j[k] = j[k] + 1;
        }
        x = (x + d) % (N * (N - 1));
    }
    for (int k = 0; k < M; k++) {
        //std::cout << i[k] << j[k] << std::endl;
        r += comp(s[i[k]-1], s[j[k]-1]);
    }
    std::cout << r << std::endl;
}