#include <bits/stdc++.h>   using namespace std;   void solve() {     int n, m;     int x, y;     int z = 1;     cin >> n >> m;     cin >> x >> y;     cout << x <<     << y <<   n ;     cout << 1 <<     << y <<   n ;     for (int i = 1; i <= n; i++) {       vector<pair<int, int>> v;       for (int j = 1; j <= m; j++) {         if ((i == x && j == y) || (i == 1 && j == y)) continue;         v.push_back({i, j});       }       if (z) {         reverse(v.begin(), v.end());       }       for (auto it : v) {         cout << it.first <<     << it.second <<   n ;       }       z ^= 1;     }   }   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);     solve();     return 0;   }   