#include <iostream>
#include <map>
#include <vector>

using namespace std;

int main ()
{
map <string, int> resourceData;
vector <string> keys;
string currentKey;
string currentValue;


check: while (cin >> currentKey && currentKey != "stop" && cin >> currentValue)
{
            if (resourceData.find (currentKey) != resourceData.end())
            {
                resourceData[currentKey] += stoi (currentValue);
                goto check;
            }

    resourceData.insert (pair <string, int> {currentKey, stoi (currentValue)});
    keys.push_back (currentKey);
}

vector <string>::iterator itSet = keys.begin();

for (itSet; itSet != keys.end(); itSet++)
{
    cout << *itSet << " -> " << resourceData [*itSet] << endl;
}

return 0;
}