#include <iostream>
using namespace std;
int primacifra(int m)
{
while (m>9)
{
m=m/10;
}
return m;
}
int main()
{
int n, i, num, cif, cifmin, nummax;
cin >> n;
cin >> num;
cifmin=primacifra(num); nummax=num;
for (i=2; i<=n; ++i)
{
cin >> num;
cif=primacifra(num);
if (cif<cifmin) { cifmin=cif; nummax=num; }
else
{
if (cif==cifmin && num>nummax) nummax=num;
}
}
cout << nummax << endl;
return 0;
}