include[HTML_REMOVED]

include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;
string a;
string b,c;
int main()
{
getline(cin,a);
a.pop_back();
int num=0;
stringstream sin(a);
while(sin>>b)
{
if(num<b.size())
{
num=b.size();
c=b;
}
}
cout<<c<<endl;
}