#include <bits/stdc++.h>
using namespace std;
 
int main() {
    map<string, int> atomCount; // Menyimpan jumlah atom per unsur
    int n; // jumlah input
    cin >> n;
 
    for (int i = 0; i < n; i++) {
        string elem;
        int count;
        cin >> elem >> count;
        atomCount[elem] += count; // menambahkan jumlah atom jika unsur sudah ada
    }
 
    // Mencetak hasil sesuai urutan input pertama kali muncul
    for (auto &p : atomCount) {
        cout << p.first << " " << p.second << " ";
    }
    cout << endl;
    return 0;
}

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MSBDIDEgSCAzIENsIDEKMiBIIDIgTyAx

1 C 1 H 3 Cl 1
2 H 2 O 1