import sys
input = sys.stdin.readline

D=dict()
def calc(N,m):
    if (N,m) in D:
        return D[N,m]

    if N<=9:
        ANS=0
        for i in range(N+1):
            ANS+=max(i,m)
        D[N,m]=ANS
        return ANS

    now=1
    for i in range(1,20):
        if N>=now:
            keta=now
        else:
            break
        now=now*10

    ANS=0
    x=N//keta

    #print(keta,x)
    for i in range(x):
        ANS+=calc(keta-1,max(i,m))
    ANS+=calc(N%keta,max(x,m))

    D[N,m]=ANS
    return ANS

    
    
    

t=int(input())

for tests in range(t):
    L,R=list(map(int,input().split()))

    ANS=calc(R,0)-calc(L-1,0)

    print(ANS)