#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
#define rep(i, l, r) for (int i = l; i <= r; ++i)
const int N = 1e3 + 5;
int n; char s[N];  

int main () {
  ios :: sync_with_stdio(0), cin.tie(0), cout.tie(0); 
  cin >> n >> (s + 1); 
  rep(i, 1, n) if(s[i] != 'L') 
    s[i] = ((s[i + 1] != 'L' && s[i - 1] != 'L') ? 'C' : '.'); 
  rep(i, 1, n) cout << s[i]; cout << '\n'; 
  return 0; 
}