3287

#include <iostream>
#include<fstream>
using namespace std;
ifstream fin("cifrazecmax.in");
ofstream fout("cifrazecmax.out");
int main()
{
    int fr[10]= {0},fr1[10]= {0},x,i,c,p=-1;
    i=0;
    while(fin>>x)
    {
        i++;
        c=x/10%10;
        fr[c]++;
        fr1[c]=i;
    }
    int maxim=0;

    for(i=0; i<=9; i++)
    {
        if(maxim<fr[i])
        {
            maxim=fr[i];
            p=i;
        }else
        if(maxim==fr[i] and fr1[p]>fr1[i])
          p=i;
    }
    fout<<fr1[p];
    return 0;
}