vf = int(input())
vl = int(input())
hf = int(input())
hl = int(input())
for a in range(hf, hl + 1):
    print (" ", a, end="")
print()
for i in range(vf, vl + 1):
    print (i, end=' ')
    for j in range(hf, hl + 1):
        print(j * i, end='  ')
    print()