def solve(N, K):
    SN = str(N)
    NN = len(SN)
    SK = str(K)
    NK = len(SK)
    cnt = 0
    for i in range(NN):
        start = 10 ** i
        if NK > i:
            end = int(SK[:i + 1])
            if end > K:
                end = K
        else:
            end = K * 10 ** (i - NK + 1) - 1
            if end > N:
                end = N
        cnt += end - start + 1
        # print(i,start,end,cnt)
    return cnt

T = int(input())
for t in range(T):
    N, K = map(int, input().split())
    print(solve(N, K))