spiral

n=int(input())
matrix=[]
spiral=[]
for i in range(n):
    line=[int(x) for x in input().split()]
    matrix.append(line)
for i in range(n):
    spiral.append(matrix[0][i])
h=n-1
k=1
l=n-1
m=n-2
q=n-2
p=0
r=1
s=1
o=1
for i in range((n-1)*2):
    if(i%4==0):
        for j in range(n-o):
            spiral.append(matrix[k+j][h])
        h=h-1
        k=k+1
    if(i%4==1):
        for j in range(n-o):
            spiral.append(matrix[l][m-j])
        l=l-1
        m=m-1
    if(i%4==2):
        for j in range(n-o):
            spiral.append(matrix[q-j][p])
        q=q-1
        p=p+1
    if(i%4==3):
        for j in range(n-o):
            spiral.append(matrix[r][s+j])
        r=r+1
        s=s+1
    if(i%2!=0): 
        o=o+1
for i in range(n*n):
    print(spiral[i],end=" ")