#include<bits/stdc++.h> using namespace std; int main() { long long a[2000], m, n, sum = 0; cin >> n; for (int i = 1; i <= n; i++) { cin >> a[i]; } cin >> m; for (int i = 1; i <= n; i++) { if (a[i] == m) { cout << i << " "; break; } } for (int i = n; i >= 1; i--) { if (a[i] == m) { cout << i; break; } } for (int i = 1; i <= n; i++) { if (a[i] != m) { sum += 1; } } if (sum == n) { cout << "-1"; } return 0; }