def f(n):
    dp = [[[0,0] for _ in range(10)] for _ in range(20)]
    dp[-1][0][0]=1
    for i in range(19, 0, -1):
        d = n//(10**(i-1))%10
        for k in range(10):
            for j in range(10):
                dp[i-1][max(j,k)][1]+=dp[i][j][1]
                if k<d:
                    dp[i-1][max(j,k)][1]+=dp[i][j][0]
        for j in range(10):
            dp[i-1][max(j,d)][0]+=dp[i][j][0]
    res = 0
    for i in range(10):
        res += i*sum(dp[0][i])
    return res

T=int(input())
for _ in range(T):
    L,R=map(int,input().split())
    print(f(R) - f(L-1))