1856 : 숫자사각형2

n,m = map(int,input().split())

for i in range(n):
    if i %2 ==0:
        for j in range(1,m+1):
            print(i*m+j,end=' ')
    else:
        for j in range(m):
            print((i+1)*m-j,end=' ')
    print()