class SegmentTree(object):
    def __init__(self, A, dot, unit):
        n = 1 << (len(A) - 1).bit_length()
        tree = [unit] * (2 * n)
        for i, v in enumerate(A):
            tree[i + n] = v
        for i in range(n - 1, 0, -1):
            tree[i] = dot(tree[i << 1], tree[i << 1 | 1])
        self._n = n
        self._tree = tree
        self._dot = dot
        self._unit = unit

    def __getitem__(self, i):
        return self._tree[i + self._n]

    def update(self, i, v):
        i += self._n
        self._tree[i] = v
        while i != 1:
            i >>= 1
            self._tree[i] = self._dot(self._tree[i << 1], self._tree[i << 1 | 1])

    def add(self, i, v,ope):
        self.update(i, ope(self[i],v))

    def sum(self, l, r): #これで[l,r)から取り出す。
        l += self._n
        r += self._n
        l_val = r_val = self._unit
        while l < r:
            if l & 1:
                l_val = self._dot(l_val, self._tree[l])
                l += 1
            if r & 1:
                r -= 1
                r_val = self._dot(self._tree[r], r_val)
            l >>= 1
            r >>= 1
        return self._dot(l_val, r_val)
N,Q = map(int,input().split())
ANS = []
A = list(map(int,input().split()))
seg = SegmentTree([-1] * N,lambda x,y:max(x,y),-1)
for i in range(N):
    if A[i] == 1:
        pass
    else:
        seg.update(i,i)
for _ in range(Q):
    t,x,y = map(int,input().split())
    x-=1
    if t == 1:
        if y ==1 :
            seg.update(x,-1)
        else:
            seg.update(x,x)
    else:
        ind = seg.sum(x,y)
        if ind != -1:
            if (y-ind) % 2 == 1:
                ANS.append('F')
            else:
                ANS.append('S')
        else:
            if (y-x) % 2 == 1:
                ANS.append('F')
            else:
                ANS.append('S')
print(*ANS,sep='\n')