#include <iostream>
#include <string>
using namespace std;
int main(){
    string a,b;
    int len = 0;
    while(cin>>a){

        if(a[a.size()-1] == '.') a.pop_back(); //判断末尾是否为 " . "

        if(a.size()>len) len = a.size(),b=a;
    }
    cout<<b;
    return 0;
}