m = int(input("ingresar columnas : "))
n= int(input("ingresar filas : "))
x = []
for i in range (m):
  x.append([0]*n)
for i in range (m):
  for j in range (n):
    x[i][j]= input("ingresar numero(filas-columna):")
for i in range (m):
  print()
  for j in range (n):
    print(x[i][j], "-", end="")
i = 0
j = 0
aux = 1
print()
print(x[i][j])
i = i + 1
print (x[i][j])
while (i>=0):
  i = i - 1
  j = j + 1
  aux = i
  if (i==0):
    print(x[i][j])
    j = 0
    i = aux + 2
    aux = aux + 1
    print(x[i][j])
    while (j>= 0):
      i = i - 1
      j = j + 1
      print(x[i][j])
      while(i<m):
        i = aux + 2
        j = 0
        print(x[i][j])
      while  (j >= 0 ):
        i = i - 1
        j = j + 1
        print(x[i][j])
    i = i - 1
    j = j + 1