#include <iostream>
#include <vector>
#include <deque>

using namespace std;
void dfs()
int main(){
    int itemize = 0; // 定义必要变量
    int a[4][4];
    deque<pair<int, int>> sp;

    for(int i = 0; i < 4; i++){
        for(int j = 0; j < 4; j++){
            cin >> a[i][j];
            if(a[i][j] == 0){
                sp.push_back({i, j});
            }
        }
    }
    
    return 0;
}