prgrafuri

#include <cstdio>
#include <fstream>
using namespace std;
int n,a[101][101],x,y,i,j,maxx,m,nr;
FILE*f=fopen("gradmax.in","r");
FILE*g=fopen("gradmax.out","w");
int main()
{
    int s=0;
    fscanf(f,"%d",&n); //cin>>n;
    while(!feof(f))
    {
        fscanf(f,"%d",&x);
        fscanf(f,"%d",&y);
        a[x][y]=a[y][x]=1;
    }
    for(i=1; i<=n; i++)
    {
        s=0;
        for(j=1; j<=n; j++)
            s=s+a[i][j];
        a[i][0]=s;
    }

    for(i=1; i<=n; i++)
    {
        if(a[i][0]>maxx)
           {
               maxx=a[i][0];
               nr=1;
           }
        else if(maxx==a[i][0])
                    nr++;
    }

    fprintf(g,"%d ",nr);
    for(i=1; i<=n; i++)
    {
        if(a[i][0]==maxx)
            fprintf(g,"%d ",i);
    }



    return 0;
}