#include <bits/stdc++.h>
using namespace std;
const int N = 103, M = 998244353;
const int mod = M - 1;
struct matrix {
  int row, col;
  int a[N][N];
  matrix() { memset(a, 0, sizeof a); }
  matrix(int r, int c) : row(r), col(c) { memset(a, 0, sizeof a); }
  matrix operator*(const matrix &p) {
    assert(col == p.row);
    matrix ret(row, p.col);
    long long mod2 = (long long)mod * mod;
    for (int i = 0; i < ret.row; ++i) {
      for (int j = 0; j < ret.col; ++j) {
        long long sum = 0;
        for (int k = 0; k < col; ++k) {
          sum += (1LL * a[i][k] * p.a[k][j]);
          if (sum >= mod2) sum -= mod2;
        }
        ret.a[i][j] = sum % mod;
      }
    }
    return ret;
  }
  matrix power(int p) {
    assert(row == col);
    matrix base = *this;
    matrix ret(row, col);
    for (int i = 0; i < row; ++i) ret.a[i][i] = 1;
    while (p > 0) {
      if (p & 1) ret = ret * base;
      base = base * base;
      p >>= 1;
    }
    return ret;
  }
};
inline int gcd(int a, int b) { return a ? gcd(b % a, a) : b; }
int powMod(int a, int b, int p) {
  int res = 1;
  while (b) {
    if (b & 1)
      res = (res * 1LL * a % p), --b;
    else
      a = (a * 1LL * a % p), b >>= 1;
  }
  return res;
}
int primitive_root(int p) {
  vector<int> fact;
  int phi = p - 1, n = phi;
  for (int i = 2; i * i <= n; ++i) {
    if (n % i == 0) {
      fact.push_back(i);
      while (n % i == 0) n /= i;
    }
  }
  if (n > 1) fact.push_back(n);
  for (int res = 2; res <= p; ++res) {
    bool ok = true;
    for (int factor : fact) {
      if (powMod(res, phi / factor, p) == 1) {
        ok = false;
        break;
      }
    }
    if (ok) return res;
  }
  return -1;
}
int discrete_log(int a, int b, int m) {
  long long n = (int)sqrt(m + .0) + 1;
  map<int, int> Hash;
  for (int i = n; i >= 1; i--) Hash[powMod(a, i * n, m)] = i;
  for (int i = 0; i <= n; i++) {
    int cur = (powMod(a, i, m) * b) % m;
    if (Hash.count(cur)) {
      int ans = Hash[cur] * n - i;
      if (ans < m) return ans;
    }
  }
  return -1;
}
vector<int> discrete_root(int n, int k, int a) {
  if (a == 0) return vector<int>(1, 0);
  int g = primitive_root(n);
  int sq = (int)sqrt(n + .0) + 1;
  vector<pair<int, int> > dec(sq);
  for (int i = 1; i <= sq; ++i)
    dec[i - 1] = make_pair(powMod(g, int(i * sq * 1LL * k % (n - 1)), n), i);
  sort(dec.begin(), dec.end());
  int any_ans = -1;
  for (int i = 0; i < sq; ++i) {
    int my = int(powMod(g, int(i * 1LL * k % (n - 1)), n) * 1LL * a % n);
    vector<pair<int, int> >::iterator it =
        lower_bound(dec.begin(), dec.end(), make_pair(my, 0));
    if (it != dec.end() && it->first == my) {
      any_ans = it->second * sq - i;
      break;
    }
  }
  if (any_ans == -1) return vector<int>();
  int delta = (n - 1) / gcd(k, n - 1);
  vector<int> ans;
  for (int cur = any_ans % delta; cur < n - 1; cur += delta) {
    ans.push_back(powMod(g, cur, n));
    break;
  }
  sort(ans.begin(), ans.end());
  return ans;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  matrix ank(n, n);
  for (int i = 0; i < n; i++) cin >> ank.a[0][i];
  for (int j = 1; j < n; j++) ank.a[j][j - 1] = 1;
  int k, x;
  cin >> k >> x;
  ank = ank.power(k - n);
  int pw = ank.a[0][0];
  auto res = discrete_root(M, pw, x);
  if (res.empty()) res.push_back(-1);
  cout << res.front() << endl;
  return 0;
}
