#include<bits/stdc++.h>
using namespace std;
int main()
{
    char s[260],w[100];
    int k = 0;
    char t[100];
    cin.getline(s,260);
    for(int i = 0;i<strlen(s);i++)
    {
        if(s[i] != ' ')
        {
            w[k] = s[i];
            k++;

            if(s[i+1] == ' ' || s[i+1] == '\0')
            {
                w[k] = '\0';
                //cout<<w<<endl;
                //cout<<strlen(w)<<endl;
                if(strlen(w) > strlen(t))
                {
                    strcpy(t,w);
                }
                k=0;
            }
        }
    }
    cout<<t;
}
/**************************************************************
	Problem: 1107
	User: wuyichen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/