#include <bits/stdc++.h>

using namespace std;
ifstream fin("moretime.in");
ofstream fout("moretime.out");
int n,nr=0,c[10005],b[10005],x,y,s;
int primcif(int n)
{
    while(n>9)
        n/=10;
    return n;
}
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
     {
      fin>>x>>y;
      if(primcif(x)==x%10)
       {
          nr++;
          c[nr]=x;
          b[nr]=y;
       }
     }
     fout<<nr<<endl;
     int r[nr]={0};
     s=0;
     for(int i=1;i<=nr;i++)
     {
        s+=b[i];
        if(s%nr==0)
         {
          fout<<i<<endl;
          for(int j=1;j<=i;++j)
              fout<<c[j]<<" ";
          return 0;
         }
         else
            if(r[s%nr]==0)
             r[s%nr]=i;
         else
         {
             fout<<i-r[s%nr]<<endl;
          for(int j=r[s%nr]+1;j<=i;++j)
              fout<<c[j]<<" ";
          return 0;
         }

     }

    return 0;
}