#include <algorithm>
#include <bitset>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <unordered_set>
using namespace std;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
#define GET_MACRO(_1, _2, _3, NAME, ...) NAME
#define _rep(i, n) _rep2(i, 0, n)
#define _rep2(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define rep(...) GET_MACRO(__VA_ARGS__, _rep2, _rep)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
using i64 = long long;
template<class T, class U>
bool chmin(T& a, const U& b) { return (b < a) ? (a = b, true) : false; }
template<class T, class U>
bool chmax(T& a, const U& b) { return (b > a) ? (a = b, true) : false; }
inline void YesNo(bool f) { std::cout << (f? "Yes": "No") << std::endl; }

template<typename T>istream& operator>>(istream&i,vector<T>&v){rep(j,v.size())i>>v[j];return i;}
template<typename T>string join(vector<T>&v){stringstream s;rep(i,v.size())s<<' '<<v[i];return s.str().substr(1);}
template<typename T>ostream& operator<<(ostream&o,vector<T>&v){if(v.size())o<<join(v);return o;}
template<typename T>string join(vector<vector<T>>&vv){string s="\n";rep(i,vv.size())s+=join(vv[i])+"\n";return s;}
template<typename T>ostream& operator<<(ostream&o,vector<vector<T>>&vv){if(vv.size())o<<join(vv);return o;}

template<class T, T (*op) (T, T), T (*e)()>
struct SegmentTree
{
    private:
        std::vector<T> data;
        int _n, size;

        void update(int k)
        {
            data[k] = op(data[k << 1], data[k << 1 | 1]);
        }

    public:
        SegmentTree(int n) : SegmentTree(std::vector<T>(n, e())) {}
        SegmentTree(const std::vector<T>& v) : size(int(v.size()))
        {
            for (_n = 1; _n < size; _n *= 2);
            data.resize(2 * _n, e());
            for (int i = 0; i < size; i++) data[i + _n] = v[i];
            for (int i = _n - 1; i > 0; i--) update(i);
        }

        void set(int i, const T x)
        {
            assert(0 <= i && i < size);
            i += _n;
            data[i] = x;
            while (i > 1)
            {
                i >>= 1;
                update(i);
            }
        }

        void add(int i, const T x)
        {
            assert(0 <= i && i < size);
            i += _n;
            data[i] += x;
            while (i > 1)
            {
                i >>= 1;
                update(i);
            }
        }

        T get(int i)
        {
            assert(0 <= i && i < size);
            return data[i + _n];
        }

        T prod(int l, int r)
        {
            assert(0 <= l && l <= r && r <= size);
            T lf = e(), rf = e();
            l += _n;
            r += _n;
            while(l < r)
            {
                if (l & 1) lf = op(lf, data[l++]);
                if (r & 1) rf = op(data[--r], rf);
                l >>= 1;
                r >>= 1;
            }
            return op(lf, rf);
        }

        T all_prod() const { return data[1]; }

        template<bool (*f) (T, T)>
        int min_left(int l, int r, T target)
        {
            assert(0 <= l && l <= r && r <= size);

            l += _n;
            r += _n;

            vector<int> lv, rv;

            while (l < r)
            {
                if (l & 1)
                {
                    lv.push_back(l++);
                }
                if (r & 1)
                {
                    rv.push_back(--r);
                }

                l >>= 1;
                r >>= 1;
            }

            while (!rv.empty())
            {
                lv.push_back(rv.back());
                rv.pop_back();
            }
            T now = e();

            for (auto i: lv)
            {
                if (f(op(now, data[i]), target))
                {
                    while (true)
                    {
                        if(f(op(now, data[i]), target))
                        {
                            if (i >= _n) return i - _n;
                            i <<= 1;
                        }
                        else now = op(now, data[i++]);
                    }
                }
                else now = op(now, data[i]);
            }

            return -1;
        }

        template<bool (*f) (T, T)>
        int max_right(int l, int r, T target)
        {
            assert(0 <= l && l <= r && r <= size);

            l += _n;
            r += _n;

            vector<int> lv, rv;

            while (l < r)
            {
                if (l & 1)
                {
                    lv.push_back(l++);
                }
                if (r & 1)
                {
                    rv.push_back(--r);
                }

                l >>= 1;
                r >>= 1;
            }

            while (!lv.empty())
            {
                rv.push_back(lv.back());
                lv.pop_back();
            }
            T now = e();

            for (auto i: rv)
            {
                if (f(op(data[i], now), target))
                {
                    while (true)
                    {
                        if(f(op(data[i], now), target))
                        {
                            if (i >= _n) return i - _n;
                            i <<= 1;
                            i++;
                        }
                        else now = op(data[i--], now);
                    }
                }
                else now = op(data[i], now);
            }

            return -1;
        }
};

int op(int a, int b) {
    return max(a, b);
}

int e(){
    return 0;
}

bool se(int a, int b) {
    return a > 1;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, q;
    cin >> n >> q;
    vector<int> a(n);
    cin >> a;
    SegmentTree<int, op, e> seg(a);
    while (q--) {
        int t, x, y;
        cin >> t >> x >> y;
        x--;
        if (t == 1) {
            seg.set(x, y);
        }
        else {
            if (seg.prod(x, y) > 1) {
                auto z = seg.max_right<se>(x, y, 0);
                assert(z != -1);
                auto w = y - z + 1;
                cout << (w & 1? 'S': 'F') << "\n";
            }
            else {
                cout << ((y - x) & 1? 'F': 'S') << "\n";
            }
        }
    }
}