Merge Columns Fold to the Right

Merge Columns Fold to the Right: An integer matrix with R rows and C columns is passed as the input. The programs must fold the matrix towards the right starting from N^th column and merge(add the cell values) the overlapping column values. Then the program must print the resulting matrix.

Boundary Condition(s):
2 <= R, C <= 50
1 <= Matrix element value <= 10^4
1 <= N <= C

Input Format:
The first line contains R and C separated by a space.
The next R lines, each contains C integers separated by a space.
The (R+2)^th line contains N.

Output Format:
The first R lines containing the folded matrix based on the given conditions.

Example Input/Output 1:
Input:
3 5
1 2 3 4 5
2 4 6 8 2
10 20 30 40 50
4

Output:
9 3 2 1
10 6 4 2
90 30 20 10

Explanation:
The matrix must be folded from the fourth column towards the right. So the 4^th column will merge with the 5^th column.
So the 1^st column values are 4+5=9, 8+2=10 and 40+50=90.
The 2^nd column values are 3, 6 and 30.
The 3^rd column values are 2, 4 and 20.
The 4^th column values are 1, 2 and 10.
Hence the output is
9 3 2 1
10 6 4 2
90 30 20 10

Example Input/Output 2:
Input:
3 5
1 2 3 4 5
4 8 6 7 9
10 20 30 45 55
2

Output:
5 5 5
14 11 9
50 55 55

Example Input/Output 3:
Input:
3 5
1 2 3 4 5
2 4 6 8 2
10 20 30 40 50
5

Output:
5 4 3 2 1
2 8 6 4 2
50 40 30 20 10

r,c=map(int,input().split())
List=[list(map(int,input().split()))for i in '.'*r]
n=int(input())
for i in range(r):
    for j in range(c):
        if((n-1-j)>-1 and (n+j)<c):
            print(List[i][n-1-j]+List[i][n+j],end=" ")
        elif(n-1-j>=0):
            print(List[i][n-1-j],end=" ")
        elif(n+j<c):
            print(List[i][n+j],end=" ")
        else:
            break
    print()