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

js,os=0,0

for i in range(n):
    for j in range(m):
        str1=str(a[i][j])
        if str1==str1[::-1]:
            print(str1)


/**************************************************************
	Problem: 1403
	User: admin
	Language: Python
	Result: Accepted
	Time:182 ms
	Memory:34480 kb
****************************************************************/