#include <iostream>
using namespace std;

char *remove_duplicates(char* str, int n) {
    if (n < 2)
        return str;

    int k = 0;
    for (int i = 1; i < n; i++)
        if (str[k] != str[i])
            str[++k] = str[i];
    str[++k] = '\0';
    return str;
}


int main() {
    int n;
    cin >> n;
    char *str = new char[n];
    cin >> str;
    str[n] = '\0';
    cout << remove_duplicates(str, n) << endl;

    return 0;
}