#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long int n;
  cin >> n;
  string s1;
  cin >> s1;
  vector<pair<char, int> > v;
  long long int sz = s1.size();
  long long int j = 0;
  while (j < sz) {
    char ch = s1[j];
    if (v.empty() || v.back().first != ch)
      v.push_back({ch, 1});
    else
      v.back().second++;
    j++;
  }
  long long int ans;
  if (v.front().second > 1) {
    ans = v.front().second - 1;
  } else
    ans = 1;
  string s2 = "";
  s2 += v.front().first;
  long long int f = 0;
  for (long long int i = 1; i < v.size(); i++) {
    if (f) {
      s2 += v[i].first;
      f = 0;
    } else {
      if (v[i].second == 1) {
        s2 += v[i].first;
        f = 1;
      } else {
        s2 += v[i].first;
        s2 += v[i].first;
      }
    }
  }
  long long int sz2 = s2.size();
  if (sz2 == 0 || sz2 % 2 == 0) {
    cout << n - sz2 << endl;
    cout << s2 << endl;
  } else {
    cout << n - sz2 + 1 << endl;
    s2[sz2 - 1] = '\0';
    long long int j = 0;
    while (j < sz2 - 1) {
      cout << s2[j];
      j++;
    }
  }
  return 0;
}
