package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var t int
	fmt.Fscan(reader, &t)

	for i := 0; i < t; i++ {
		var n int
		var s string
		fmt.Fscan(reader, &n, &s)

		if n%2 == 1 {
			razeWins := false
			for j := 0; j < n; j += 2 {
				if (s[j]-'0')%2 == 1 {
					razeWins = true
					break
				}
			}
			if razeWins {
				fmt.Fprintln(writer, 1)
			} else {
				fmt.Fprintln(writer, 2)
			}
		} else {
			breachWins := false
			for j := 1; j < n; j += 2 {
				if (s[j]-'0')%2 == 0 {
					breachWins = true
					break
				}
			}
			if breachWins {
				fmt.Fprintln(writer, 2)
			} else {
				fmt.Fprintln(writer, 1)
			}
		}
	}
}