#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <math.h> 
using namespace std;
#define DATA_MAX 100
#define COLUMN 2
int main(int argc, char *argv[] ){
  int i,j,num;
  double data[COLUMN][DATA_MAX];
  num=0;
  while(cin >>data[0][i]>>data[1][i]){
    i++;
  }
  num=i;
  cout << num <<endl;
  for (i=0;i<num; i++){
    for(j=0;j<COLUMN;j++){
      cout << data[j][i]<<"\t";
    }
    cout <<endl;
  }

  return 0;
}