a = int(input())
b = int(input())
c = int(input())
d = int(input())

result = ''

for i in range(a - 1, b + 1):

    if i != a - 1:
        result += str(i)

    for j in range(c, d + 1):
        if i == a - 1:
            result += '\t' + str(j)
        else:
            result += '\t' + str(j * i)

    result += '\n'

print(result)