#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

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

int e(){
	return 1;
}

bool f(int x){
	return x<=1;
}

int main(){
	
	int N,Q;
	cin>>N>>Q;
	
	vector<int> a(N);
	rep(i,N)cin>>a[i];
	
	segtree<int,op,e> seg(a);
	
	rep(_,Q){
		int t,x,y;
		cin>>t>>x>>y;
		if(t==1){
			seg.set(x-1,y);
		}
		else{
			x--;
			int l = seg.min_left<f>(y);
			l = max(l,x);
			int r = y;
			if(l==x){
				if((r-l)%2==1)cout<<'F'<<endl;
				else cout<<'S'<<endl;
			}
			else{
				if((r-l)%2==0)cout<<'F'<<endl;
				else cout<<'S'<<endl;
			}
		}
	}
	
	return 0;
}