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# Swap the columns

## Statement

Given two positive integers \( m \) and \( n \), \( m \) lines of \( n \) elements, giving an \( m \times n \) matrix \( A \), followed by two non-negative integers \( i \) and \( j \) less than \( n \), swap columns \( i \) and \( j \) of \( A \) and print the result.Write a function `swap_columns(a, i, j)`

and call it to exchange the columns.

In all the problems input the data using `input()`

and print the result using `print()`

.