#include <bits/stdc++.h>
using namespace std;
int a[1001][1001];
int n,m;
void nhap()
{
cin>>n;
for (int i=1; i<=n; i++)
for (int j=1; j<=n; j++) cin>>a[i][j];
}
void giai()
{
int imax=1;
for(int i=2;i<=n;i++)
{
if (a[i][i]>a[imax][imax]) imax=i;
}
cout<<"a"<<imax<<imax<<" ";
}
int main()
{
nhap();
giai();
}
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