import sys
# input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

"""

f(i) <= k

"""
from functools import cache
m = 10
for _ in range(ni()):
    l, r = na()

    a = [0] * m
    for i in range(1, m):
        @cache
        def saiki(x):
            if x == 0:
                return 1
            if x < 0:
                return 0
            ans = 0
            for j in range(i + 1):
                ans += saiki((x - j) // 10)
            return ans
        a[i] = saiki(r) - saiki(l-1)
    
    # print(*a)
    for i in range(m-2, -1, -1):
        a[i+1] -= a[i]
    # print(*a)
    ans = 0
    for i in range(m):
        ans += i * a[i]
    print(ans)