a= input('a')
b= input('b')
c= input('c')
d= input('d')
f1=0
f2=0
f3=0
f4=0
for i in range(1)
	f1=a*c
	f2=a*d
	f3=b*c
	f4=b*d
print(f1)
print(f2)
print(f3)
print(f4)