#include"stdio.h"

void main()
{ long int m,a,b,max,min;
  long int k;
 while(scanf("%d",&m)!=EOF)
  {  max=50001;min=-50001;k=0;
      while(scanf("%ld%ld",&a,&b)&&(a||b))
        {    if(a<=0&&b>=m){ k++;
                            if(min<=a&&max>=b)
                                   {max=b;min=a;}
                            }
         }
      if(k==0)  printf("No solution\n");
       else { printf("%ld\n",k);
              printf("%ld %ld\n",min,max);}
   }
}