C++ :

#include<iostream>
#include<cstdio>
using namespace std;
int a[4][4], b[4][4], c[4][4];
int main()
{
	for (int i = 1; i <= 3; i++)
		for (int j = 1; j <= 3; j++)
			scanf("%d", &a[i][j]);
	for (int i = 1; i <= 3; i++)
		for (int j = 1; j <= 3; j++)
			scanf("%d", &b[i][j]);
	for (int i = 1; i <= 3; i++)
	    for (int j = 1; j <= 3; j++)
	        for (int k = 1; k <= 3; k++)
	        	c[i][j] += a[i][k] * b[k][j];
	cout<<c[1][1]<<" "<<c[1][2]<<" "<<c[1][3]<<endl;
	cout<<c[2][1]<<" "<<c[2][2]<<" "<<c[2][3]<<endl;
	cout<<c[3][1]<<" "<<c[3][2]<<" "<<c[3][3]<<endl;
	return 0;
}