import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val n = nextInt()
    val q = nextInt()
    val a = Array(n) { nextInt() }
    for (_i in 0 until q) {
        val t = nextInt()
        val x = nextInt()
        val y = nextInt()
        if (t == 1) {
            a[x - 1] = y
        } else {
            var count = 0
            for (i in y - 1 downTo x - 1) {
                if (a[i] == 1) count++
                else break
                if (i == x - 1) count++
            }
            println(if (count % 2 == 0) "F" else "S")
        }
    }
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", abs(1L.shl(26)))
        .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
        .apply { start() }.join()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

fun next(): String {
    while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
    return st.nextToken()
}

fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion