2D Matrix - Elements Adjacent Sum

Given a matrix of R rows and C columns, for each element print the sum of the adjacent elements.

Input Format:
The first line contains R
The second line contains C
Next R lines each contains C values separated by a space

Output Format:
R lines each containing C values which represent the sum of the adjacent elements.

Boundary Conditions:
2 <= R,C <= 50
1 <= Matrix Elements <= 100

Example Input/Output 1:
Input:
5 5
11 11 5 6 18
12 4 16 9 19

5 20 7 5 2
20 19 7 2 11
16 18 5 16 17

Output:
11 16 17 23 6
4 28 13 35 9
20 12 25 9 5
19 27 21 18 2
18 21 34 22 16

C code:

#include<stdio.h>
#include <stdlib.h>

int main()
{
int a[50][50],r,c,i,j;
scanf("%d%d",&r,&c);
for(i=0;i<r;i++)
for(j=0;j<c;j++)
scanf("%d",&a[i][j]);
for(i=0;i<r;i++)
{
    for(j=0;j<c;j++)
{
if(j==0)
printf("%d ",a[i][j+1]);
else if(j==c-1)
printf("%d ",a[i][j-1]);
else
printf("%d ",a[i][j-1]+a[i][j+1]);
}
}

}