#include <stdio.h>

int main(){
 int i,m,n,k[15][30],resn[15],len[15];
 FILE *in,*out;
 in=fopen("input.txt","r");
 out=fopen("output.txt","w");
 fscanf(in,"%d",&n);
 for(i=0;i<m;i++) fscanf(in,"%d",&k[i]);
 fprintf(out,"%d",-1);
 fclose(in);  fclose(out);
}