package main

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

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

	var t int
	if _, err := fmt.Fscan(in, &t); err != nil {
		return
	}
	for ; t > 0; t-- {
		var n int
		var s string
		fmt.Fscan(in, &n)
		fmt.Fscan(in, &s)

		hasR, hasL := false, false
		for i := 0; i < n; i++ {
			if s[i] == '>' {
				hasR = true
			} else if s[i] == '<' {
				hasL = true
			}
		}
		if !(hasR && hasL) {
			fmt.Fprintln(out, n)
			continue
		}
		ans := 0
		for i := 0; i < n; i++ {
			if s[i] == '-' || s[(i-1+n)%n] == '-' {
				ans++
			}
		}
		fmt.Fprintln(out, ans)
	}
}