#############################################################

import sys
sys.setrecursionlimit(10**7)

from heapq import heappop,heappush
from collections import deque,defaultdict,Counter
from bisect import bisect_left, bisect_right
from itertools import product,combinations,permutations

ipt = sys.stdin.readline

def iin():
    return int(ipt())
def lmin():
    return list(map(int,ipt().split()))

MOD = 998244353
#############################################################

def solve(N,K):
    L = len(N)
    cnt = 0
    for i in range(1,L):
        for j in range(i):
            if j >= len(K):
                break
            cnt += (int(K[j])-(j==0))*10**(i-j-1)
            #print(j,cnt,int(K[j])-(j==0))
        if i < len(K):
            cnt += 1
            #print("a")

    #print(cnt)
    f = 0
    for j in range(L):
        if j >= len(K):
            break
        if f == 0:
            if int(N[j]) > int(K[j]):
                cnt += (int(K[j])-(j==0))*10**(L-j-1)
                f = 1
            elif int(N[j]) < int(K[j]):
                cnt += (int(N[j])-(j==0))*10**(L-j-1)
                #f = 2
                cnt += int(N)-int(N[:j+1])*10**(L-j-1)+1
                break
            else:
                cnt += (int(K[j])-(j==0))*10**(L-j-1)
        elif f == 1:
            cnt += int(K[j])*10**(L-j-1)

    cnt += 1
    return cnt

for _ in range(iin()):
    N,K = input().split()
    print(solve(N,K))