#include<stdio.h>

#include<stdlib.h>

int main()

{

        int a, b, c, d;

        long long int z[100][100], x[100][100], c1[100][100] = {};

while ( scanf("%d %d %d %d", &a, &b, &c, &d))

{

if (b!=c)

{

printf("error\r\n");

continue;

}

for (int i = 0;i < a;i++) {

for (int j = 0; j < b; j++)

{

scanf("%d ", &z[i][j]);

}

}

for (int i = 0;i < c;i++) {

for (int j = 0; j < d; j++)

{

scanf("%d ", &x[i][j]);

}

}

for (int i = 0;i < a;i++) {

for (int j = 0; j < d; j++)

{

for (int k = 0; k < c; k++)

{

c1 [i][j]+= z[i][k] * x[k][j];

}

printf("%d ", c1[i][j]);

}

printf("\r\n");

}

}

return 0;

}