#include <iostream>
#include <sstream>

using namespace std;

int main()
{
    string s, w, word;
    getline(cin, s);

    int max = 0;
    stringstream ssin(s);
    while(ssin >> w)
    {
        int len = w.size();
        if(w[len - 1] == '.') w = w.substr(0, len - 1), len--;
        if(max < len) max = len, word = w;
    }

    cout << word;


    return 0;
}