#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    char niza[n];
    for(int i = 0; i < n; i++) {
        cin >> niza[i];
    }

    char nova_niza[n];
    int ni = 0;
    for(int i = 0; i < n; i++) {
        char c = niza[i];
        int j = i + 1;
        while(j < n and niza[j] == c) {
            j++;
        }
        i = j - 1;

        nova_niza[ni] = c;
        ni++;
    }

    for(int i = 0; i < ni; i++) {
        cout << nova_niza[i];
    }
    return 0;
}