import math
def ip():
    return map(int,input().split())
def f(x):
    print()
    lst=[]
 
    i=1
    while True:
        if x>=(10**i):
            lst.append(x//(10**i))
            i+=1
        else:
            break
 
    if len(lst)==0:
        return x-1
    print(lst)
    n=len(lst)
    sm=lst[-1]
    for i in range(n-2,-1,-1):
        lst[i]-=sm
        sm+=lst[i]
    print(lst)
    ct=0
    for i in range(n):
        ct+=(i+1)*lst[i]
    print(x-1+ct)
    return x-1+ct
 
 
 
# print(f(1))
# print(f(10))
# print(f(100))
# print(f(200))
# print(f(20))
# print(f(99))
# print(f(19))
T=int(input())
# T=1
for __ in range(T):
    l,r=ip()
    print(f(r)-f(l))
 
 

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4
1 9
9 10
10 20
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