题解

#include<iostream>
using namespace std;
int main(){
    int n,m,x,y,dx[]={0,1,0,-1},dy[]={1,0,-1,0};
    cin>>n>>m>>x>>y;
    for(int i=0;i<4;i++){
        int nx=x+dx[i],ny=y+dy[i];
        if(nx<1||nx>n||ny<1||ny>m){
            cout<<"NA\n";
        }else{
            cout<<nx<<' '<<ny<<'\n';
        }
    }
    return 0;
}