include <bits/stdc++.h>

using namespace std; int main() {

string a,c;
int b,max=0;
for(int i=0;i<5;i++)
{
	cin>>a;
	b=a.length();
	if(b>max)
	{
		max=b;
		 c=a;
	}
}
cout<<c;
return 0;

}