from sys import stdin
input = stdin.readline

for _ in range(int(input())):
    N, K = map(int, input().split())

    K = str(K)
    L = len(str(N))

    ans = len(str(K))
    n = 0
    for i in range(len(K)):
        for j in range(1 if i == 0 else 0, int(K[i])):
            n2 = n+j
            n3 = n2
            SUM = 1
            for k in range(i, L-1):
                ans += SUM
                SUM *= 10
                n2 *= 10
                n3 *= 10
                n3 += 9
            n2 = min(n2, N+1)
            n3 = min(n3, N)
            ans += n3-n2+1
        n += int(K[i])
        n *= 10

    print(ans)