memo = [[0] * 11 for _ in range(18)]

for i in range(18):
        for cur in range(10):
            memo[i][cur] = cur if i == 0 else sum(memo[i-1][max(cur, x)] for x in range(10))
def f(r):
    cur = 0
    sr = str(r)[::-1]
    ans = 0
    for i in range(len(sr))[::-1]:
        v = int(sr[i])
        for x in range(v):
            ans += memo[i][max(cur, x)]
        cur = max(cur, v)
    return ans

for _ in range(int(input())):
    l, r = map(int, input().split())
    ans = f(r+1) - f(l)
    print(ans)