SE3UdS - Online Python3 Interpreter & Debugging Tool

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))