#59110440420
#Sumet saenpang
def ge(A, b):
	pass
def solve(A, b):
	import numpy.linalg
	result = numpy.linalg.solve(A,b)
	for x in result:
		print('$x_1={}$'.format(x))
#5x3x1
m,n,_ = map(int,input().split('x'))
print(m,n)
A = []
for i in range(m):
	A.append(list(map(int, input().split(','))))
print(n,_)
#รับ b -> 2,1,3,4,4
b = list(map(int, input().split(',')))
#รับ b มาแล้ว
solve(A,b)