How to find the sum of each coloumn

import java.util.*;

public class Main {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
int n=input.nextInt();
int m=input.nextInt();
int a[][]=new int [n][m];
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
a[i][j]=input.nextInt();
}
}
int sum=0;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
sum=sum+a[j][i];

   }
    System.out.println(sum);
 }
 

}
}