include<bits/stdc++.h>

using namespace std; int main(){

int n;
cin>>n;
string longest_name="";
for (int i=0;i<n;i++) {
	string name;
	cin>>name;
	if(name.length()>longest_name.length()){
    	longest_name=name;
	}
}
cout<<longest_name<<endl;
return 0;
}