#include <bits/stdc++.h>
using namespace std;
int a[210][210];
int main() {
    int n,m,x1,y1,x2,y2,ma = INT_MIN,mi = INT_MAX;
    cin>>n>>m;
    for(int i = 1;i <= n;i++){
        for(int j = 1;j <= m;j++){
            cin>>a[i][j];
            if(a[i][j] > ma){
                ma = a[i][j];
                x1 = i;
                y1 = j;
            }
            if(a[i][j] < mi){
                mi = a[i][j];
                x2 = i;
                y2 = j;
            }
        }
    }
    if(x1 == x2 && abs(y1 - y2) == 1 || y1 == y2 && abs(x1 - x2) == 1){
        cout<<"Y";
    }else{
        cout<<"N";
    }
    return 0;
}
/**************************************************************
	Problem: 2000
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2244 kb
****************************************************************/