#include <iostream>
#include <string>
#include <iterator>
#include <algorithm>
#include <vector>
 
int main()
{
    std::vector<std::string> words;
    std::copy( std::istream_iterator<std::string>(std::cin), 
               std::istream_iterator<std::string>(),
               std::back_inserter( words ) );
 
    if( words.size() ) {
         auto it = std::max_element( words.begin(), words.end(),
                                     []( const auto &s1, const auto &s2 ) {
             return s1.length() < s2.length();
         } );
         std::cout << "index of first longest word " << *it << " is " 
                   << std::distance( words.begin(), it ) << std::endl;
    }
}

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Хливкие шорьки пырялись по наве и хрюкотали зелюки как мюмзики в мове