a, b, c, d = int(input()), int(input()), int(input()), int(input()),
for i in range (c, d + 1):
    print('\t', i, end = "")
for n in range (a, b + 1):
    print('\n', n, end = '\t')
    for m in range (c, d + 1):
        print(m * n, end = '\t')