import sys
input = sys.stdin.readline


def calc(digits, N):
    if digits < N[:len(digits)]:
        cnt = 0
        for d in range(len(N)-len(digits)+1):
            cnt += 10**d
        return cnt
    if digits > N[:len(digits)]:
        cnt = 0
        for d in range(len(N)-len(digits)):
            cnt += 10**d
        return cnt

    res = 0
    cnt = 1
    for d in range(len(digits), len(N)):
        res = res * 10 + N[d]
    cnt += res
    for d in range(len(N)-len(digits)):
        cnt += 10**d
    return cnt


T = int(input())
for _ in range(T):
    N, K = map(int, input().split())
    N = list(map(int, str(N)))
    K = list(map(int, str(K)))
    ans = 0

    for i, x in enumerate(K):
        for y in range(x):
            if i == 0 and y == 0:
                continue
            ans += calc(K[:i] + [y], N)
        ans += 1

    print(ans)