LongestWord

#include <string>
#include <iostream>

using namespace std;

string LongestWord(string s)
{
    int max_len, i;
    string s1, word;
    s += ' ';
    s1 = 'w';
    s1.clear();
    max_len = 0;
    for (i = 0; i < s.size(); i++) {
        if (s[i] > 64 && s[i] < 91 || s[i] > 96 && s[i] < 123)
            s1 += s[i];
        else {
            if (s1.size() > max_len) {
                max_len = s1.size();
                word = s1;
            }
            s1.clear();
        }
    }
    return word;
}
int main()
{
    string s;
    getline(cin, s);
    cout << LongestWord(s);
    return 0;
}