#include <stdio.h>

#define SIZE 32

int is_column_valid(int col, int n, int m, int a[SIZE][SIZE])

{

    for (int * i = *a; i < *(a + n); i += SIZE)

    {

        for (int *j = *a; j < i; j += SIZE)

        {

            if (*(i + col) == *(j + col))

            {

                return 0;
            }

        }

    }

    return 1;
}

void remove_column(int col, int n, int m, int a[SIZE][SIZE])

{

    for (int i = col + 1; i < m; ++i)

    {

        for (int * j = *a; j < *(a + n); j += SIZE)

        {
            int tmp = *(j + i - 1);
            *(j + i - 1) = *(j + i);
            *(j + i) = tmp;
        }

    }

}

int main()

{

    int n, m;
    scanf("%d %d", &n, &m);

    int a[SIZE][SIZE];

    for (int * i = *a; i < *(a + n); i += SIZE)
        for (int * j = i; j < i + m; j++)
            scanf("%d", j);

    for (int *i = *a; i < *(a + m); i += SIZE)

    {

        if (!is_column_valid((i - *a)/SIZE, n, m, a))

        {

            remove_column((i - *a)/SIZE, n, m, a);
            m--;
            i-= SIZE;
        }

    }

    for (int * i = *a; i < *(a + n); i += SIZE)

    {

        for (int * j = i; j < i + m; j++)

            printf("%d ", *j);
        printf("\n");
    }

}