#include <iostream>

using namespace std;

int main()
{
    int n,cifMin=9,nrMax=0;
    cin>>n;
    while(n>0)
    {
        int x;
        cin>>x;
        int copie=x;
        int inv = 0;
        while(x>0)
        {
            inv = inv*10+(x%10);
            x=x/10;
        }
        x=inv%10;

        if(x<=cifMin)
            if(copie>=nrMax)
            {
                cifMin = x;
                nrMax = copie;
            }

        n=n-1;
    }
    cout<<nrMax;
}