Exer05_20.cpp

#include <iostream>
#include <string>
using std::cout;
using std::cin;
using std::endl;
using std::string;
int main()
{
    string s, sLast;
    bool repeated = false;
    while(cin >> s && !s.empty())
    {
        if(s == sLast)
        {
            cout << s << endl;
            repeated = true;
            break;
        }
        else
            sLast = s;
    }
    if(!repeated)
        cout << "No word was repeated." << endl;
    return 0;
}