#include <iostream>
using namespace std;

int main()
{
    int curp = 0;
    int curl = 0;
    int maxp = 0;
    int maxl = 0;
    int size = 80;
    char str[size];
    cin.getline(str,size);
    if((str[0] >= 'a' && str[0] <= 'z') || (str[0] >= 'A' && str[0] <= 'Z'))
    {
        curl = 1;
    }
    for(int i = 1 ; str[i] != 0; i++)
    {
        if(!(str[i] >= 'a' && str[i] <= 'z'))
        {
            if(str[i+1] >= 'a' && str[i+1] <= 'z')
            {
                curp = i+1;
            }
        }
        else
        {
            if(str[i-1] >= 'a' && str[i-1] <= 'z')
            {
                curl++;
            }
            else if(str[i] >= 'a' && str[i] <= 'z')
            {
                if(!(str[i-1] >= 'a' && str[i-1] <= 'z'))
                {
                    curl = 1;
                }
            }
        }
        if(!(str[i] >= 'a' && str[i] <= 'z'))
        {
            if(str[i-1] >= 'a' && str[i-1] <= 'z')
            {
                curl = i -1;
            }
        }
        if(maxl<curl)
        {
            maxl = curl;
            maxp = curp;
        }
    }
for(int p = 0; p <= maxl; p++)
{
 cout<<str[maxp+p];
}
}