#include using namespace std; using ll = long long; using P = pair; #define fix(x) fixed << setprecision(x) #define asc(x) x, vector, greater #define rep(i, n) for(ll i = 0; i < n; i++) #define all(x) (x).begin(),(x).end() templatebool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;} templatebool chmax(T&a, const T&b){if(a struct BIT{ int n; vector data; BIT(int n=0) : n(n), data(n+1){} T sum(int i){ T res = 0; for(; i; i -= i&-i){ res += data[i]; } return res; } void add(int i, T x){ for(; i <= n; i += i&-i){ data[i] += x; } } }; int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); int n,q; cin >> n >> q; vector a(n); BIT bit(n); rep(i,n){ cin >> a[i]; if(a[i]==1) bit.add(i+1, 1); } rep(i,q){ int t,x,y; cin >> t >> x >> y; if(t==1){ x--; bit.add(x+1, (y==1)-(a[x]==1)); a[x] = 1; }else cout << ((bit.sum(y)-bit.sum(x))&1?"S\n":"F\n"); } return 0; }