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 i := 0; i < t; i++ {
		var l, r int
		fmt.Fscan(in, &l, &r)
		ans := 0
		for r > 0 {
			ans += r - l
			r /= 10
			l /= 10
		}
		fmt.Fprintln(out, ans)
	}
}