#include<iostream>
#include<cstring>
#include<sstream>
using namespace std;
int main()
{
    string s,smax;
    int maxs=0;
    getline(cin,s);
    int len=s.size();
    s[len-1]=' ';
    stringstream scin(s);
    string s1;
    while(scin>>s1){
        if(maxs<s1.size()){
            maxs=s1.size();
            smax=s1;
        }
    }
    cout<<smax;
    return 0;
}