#ifndef POINTER06_H_
#define POINTER06_H_

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>

void int_swap (int &a, int &b);

int main ()
{
    int n;
    scanf("%d", &n);

    for (int i = 0, a, b; i < n; i++)
    {
        scanf("%d%d", &a, &b);
        int_swap(a, b);
        printf("%d %d\n", a, b);
    }
}
#endif // POINTER06_H_