n,m=list(map(int,input().split()))
a=list()
for i in range(n):
    a.append(list(map(int,input().split())))



for i in range(1,n-1):
    for j in range(1,n-1):
        if(a[i][j]>a[i-1][j] and a[i][j]>a[i][j+1] and a[i][j]>a[i+1][j] and a[i][j]>a[i][j-1]):
            print(a[i][j])
        

/**************************************************************
	Problem: 1384
	User: admin
	Language: Python
	Result: Accepted
	Time:90 ms
	Memory:34480 kb
****************************************************************/