class SegTree:
    def __init__(self, n, e, ope, lst=[]):
        self.N0 = 2 ** (n - 1).bit_length()
        self.e = e
        self.ope = ope
        self.data = [e] * (2 * self.N0)
        if lst:
            for i in range(n):
                self.data[self.N0 + i] = lst[i]
            for i in range(self.N0 - 1, 0, -1):
                self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
    
    def build(self):
        for i in range(self.N0 - 1, 0, -1):
            self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
                
    def update(self, i, x): #a_iの値をxに更新
        i += self.N0
        self.data[i] = x
        while i > 1:
            i >>= 1
            self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
    
    def add(self, i, x):
        self.update(i, x + self.get(i))

    def set(self, i, x):
        self.data[self.N0 + i] = x
    
    def query(self, l, r): #区間[l, r)での演算結果
        if r <= l:
            return self.e
        lres = self.e
        rres = self.e
        l += self.N0
        r += self.N0
        while l < r:
            if l & 1:
                lres = self.ope(lres, self.data[l])
                l += 1
            if r & 1:
                r -= 1
                rres = self.ope(self.data[r], rres)
            l >>= 1
            r >>= 1
        return self.ope(lres, rres)
    
    def get(self, i): #a_iの値を返す
        return self.data[self.N0 + i]

n, Q = map(int, input().split())
A = list(map(int, input().split()))

mask = (1 << 30) - 1
def ope(x, y):
    x0 = x >> 30
    x1 = x & mask
    y0 = y >> 30
    y1 = y & mask

    if y0 == y1:
        z0, z1 = x0 + y0, x1 + y1
    else:
        z0, z1 = x0 + y0, y1
    return (z0 << 30) | z1

B = []
one = (1 << 30) + 1
el = 1 << 30
for a in A:
    if a == 1:
        B.append(one)
    else:
        B.append(el)
seg = SegTree(n, 0, ope, B)

for _ in range(Q):
    t, x, y = map(int, input().split())
    x -= 1
    if t == 1:
        A[x] = y
        if y == 1:
            seg.update(x, one)
        else:
            seg.update(x, el)
    else:
        z = seg.query(x, y)
        z &= mask
        if z & 1:
            print("S")
        else:
            print("F")