#include <bits/stdc++.h> using namespace std; int main() { int n, m; char a; bool f; cin >> n >> m >> a >> f; for (int i = 1; i <= m; ++ i) cout << a; cout << '\n'; if (f == false) { for (int i = 1; i <= n - 2; ++ i) { cout << a; for (int j = 1; j <= m - 2; ++ j) cout << " "; cout << a << '\n'; } } else { for (int i = 1; i <= n - 2; ++ i) { for (int j = 1; j <= m; ++ j) cout << a; cout << '\n'; } } for (int i = 1; i <= m; ++ i) cout << a; return 0; }