Untitled

def ccsp(m,n,outarr):
    k=0
    l=0
    cnt=0
    total=m*n
    while(k<m and l<n):
        if(cnt==total):
            break
        for i in range(k,m):
            print(outarr[i][l],end=",")
            cnt+=1
        l+=1 
        if(cnt==total):
            break
        for i in range(l,n):
            print(outarr[m-1][i],end=",")
            cnt+=1 
        m-=1 
        if(cnt==total):
            break
        if(k<m):
            for i in range(m-1,k-1,-1):
                print(outarr[i][n-1],end=",")
                cnt+=1 
            n-=1 
        if(cnt==total):
            break
        if(l<n):
            for i in range(n-1,l-1,-1):
                print(outarr[k][i],end=",")
                cnt+=1 
        k+=1 
def main():
    m=int(input())
    outarr=[]
    for i in range(m):
        outarr.append(list(map(int,input().split())))
    ccsp(m,len(outarr[0]),outarr)
main()