#include <iostream>
#include <vector>
#include <algorithm>
#include <stack>

using namespace std;

vector<vector<pair<int, int>>> sorok;
vector<bool> visited;
vector<int> color;


void DFS(int curr, int nextColor)
{
    while(!sorok[curr].empty()){
        pair<int, int> next = sorok[curr][sorok[curr].size() - 1];
        sorok[curr].pop_back();
        if(visited[next.second]){
            continue;
        }
        visited[next.second] = true;
        color[next.second] = nextColor;

        DFS(next.first, -nextColor);
        return;
    }
}

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

    vector<pair<int, int>> pontok(N);
    vector<int> koordx(N), koordy(N);
    for(int i = 0; i < N; i++){
        cin >> pontok[i].first >> pontok[i].second;
        koordx[i] = pontok[i].first;
        koordy[i] = pontok[i].second;
    }
    sort(koordx.begin(), koordx.end());
    sort(koordy.begin(), koordy.end());

    koordx.erase(unique(koordx.begin(), koordx.end()), koordx.end());
    koordy.erase(unique(koordy.begin(), koordy.end()), koordy.end());
    sorok.resize(2*N+1);

    for(int i = 0; i < N; i++){
        pontok[i].first = lower_bound(koordx.begin(), koordx.end(), pontok[i].first) - koordx.begin();
        pontok[i].second = lower_bound(koordy.begin(), koordy.end(), pontok[i].second) - koordy.begin() + N;
        sorok[pontok[i].first].push_back({pontok[i].second, i});
        sorok[pontok[i].second].push_back({pontok[i].first, i});
    }
    visited.assign(N, false);
    color.assign(N, 1);

    for(int i = 0; i < N; i++){
        int nextColor = 1;
        while(!sorok[i].empty()){
            DFS(i, nextColor);
            nextColor = -nextColor;
        }
    }

    for(int i = 0; i < N; i++){
        if(color[i] == 1){
            cout << "F";
        }
        else{
            cout << "L";
        }
    }
    cout << endl;
    return 0;
}