#include<stdio.h>
#include<stdlib.h>
int g,w,e[10001],c[10001];
int castig[10001][10001];
int main(){
	int i,j,aux;
	FILE *fin=fopen("energii.in","r");
	fscanf(fin,"%d",&g);
	fscanf(fin,"%d",&w);
	for(i=1;i<=g;i++)
		fscanf(fin,"%d %d",&e[i],&c[i]);
	int sum=0;
	for(i=1;i<=g;i++)
	{
		sum+=e[i];
	}
	for(i=1;i<g;i++)
		for(j=i+1;j<=g;j++)
			if((e[i]>e[j])||((e[i]==e[j])&&(c[i]>c[j]))){
				aux=e[i];
				e[i]=e[j];
				e[j]=aux;
				aux=c[i];
				c[i]=c[j];
				c[j]=aux;}
	for(i=1;i<=g;i++)
		printf("%d %d \n",e[i],c[i]);

	FILE *fout=fopen("energii.out","w");
	if(sum<w)
		fprintf(fout,"-1\n");
	return 0;
}