#include<stdio.h>
#define max 20
int main(){
    int n,m;
    scanf("%d %d",&n,&m);
    int edges[max][2];
    for(int i=0;i<n;i++){
        scanf("%d %d",&edges[i][0],&edges[i][1]);
    }
    for(int i=0;i<n;i++){
        printf("%d %d\n",edges[0][i],edges[1][i]);
    }
    return 0
}