t=int(input())
for i in range(t):
    ans=0
    a,b=map(int,input().split())
    n=len(str(b))
    for j in range(1,19-n):
        up=max(min(b*10**j,a+1),10**(n+j-1))
        dw=10**(n+j-1)
        #print(up,dw,up-dw)
        ans+=up-dw
    for j in range(n):
        up=max(min(b//(10**j),a),10**(n-j-1))
        dw=10**(n-j-1)
        #print(up,dw,up-dw)
        ans+=up-dw+1
    print(ans)