#include <iostream>
#include <string>


using namespace std;

int main(int argc,char * argv[]) {

    int max;
    string szukane_slowo = {};
    string napis[100] = {};

    for(int i=1;i<=argc;i++){
        napis[i] = napis[i] + argv[i];


        if(max<napis[i].length()){
            max = napis[i].length();
            szukane_slowo = napis[i];
        }else{
            max = max;
            szukane_slowo = szukane_slowo;
        }

    }
    cout<<szukane_slowo;

    return 0;
}