#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
string ans = "";
string c[505];
int i = 0;
int len = 0;
int cnt = 0;
while(cin >> c[i])
{
len = c[i].length();
string tem = c[i];
if(tem[len - 1] == '.')
{
if(len - 1 > cnt)
{
for(int j = 0; j < len - 1; j++)
cout << tem[j];
return 0;
}
}
else if (len > cnt)
{
ans = tem;
cnt = len;
}
i++;
}
cout << ans;
}