#include <iostream>
using namespace std;
 
const int MAX_SIZE = 10;
const int TEN = 10;
 
int main() {
	int n, m, mt[MAX_SIZE + 1][MAX_SIZE + 1];
	cin >> n >> m;
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			cin >> mt[i][j];
		}
	}
	int magicNo = 0 , flag = 1;
	int startLine, startCol, finishLine, finishCol;
	cin >> startLine >> startCol >> finishLine >> finishCol;
	for (int i = startLine; i <= finishLine && flag == 1; ++i) {
		for (int j = startCol; j <= finishCol && flag == 1; ++j) {
			magicNo = mt[i][j];
		//	if (magicNo == 0) {
			//	flag = 0;
		//	}
			while (mt[i][j] && flag == 1) {
				if (mt[i][j] % TEN == 0) {
					flag = 0;
				}
				mt[i][j] /= TEN;
			}
		}
	}
	cout << magicNo;
	return 0;
}

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MTAgOQoyNCAzMiA1NyA3NCA5MCAxMCA3MCA1MCAyMCAKMzEgMzAgNDEgNDMgNDAgMzIgOTcgMTAgMjAgCjMwIDg2IDMyIDkwIDcwIDEwIDE3IDEzIDE3ICAgCjEyIDEzIDM3IDE5IDE0IDE1IDE3IDE2IDkxCjE3IDExIDg4IDM5IDk5IDk5IDUyIDIyIDgzICAgCjIzIDIwIDI0IDAgMjcgMjMgMjYgMjEgODcgCjI4IDIzIDMwIDExIDEzIDM3IDM2IDM0IDM5IAozMCAzOSAzNiAzNyAzNyAzOCAzOCAzNyA0OSAKNDkgNDIgNDEgMzMgOTkgNDQgODkgNDUgMzcKNzMgNDkgNzQgOTcgNDUgODAgNzUgNDkgNTAKNCA0IDkgOSA=

10 9
24 32 57 74 90 10 70 50 20 
31 30 41 43 40 32 97 10 20 
30 86 32 90 70 10 17 13 17   
12 13 37 19 14 15 17 16 91
17 11 88 39 99 99 52 22 83   
23 20 24 0 27 23 26 21 87 
28 23 30 11 13 37 36 34 39 
30 39 36 37 37 38 38 37 49 
49 42 41 33 99 44 89 45 37
73 49 74 97 45 80 75 49 50
4 4 9 9