MOD=7000000001
def slv2(x):
    ans=int(x[0])*(int(x[0])-1)//2*10**(len(x)-1)+int(x[0])*(int('0'+x[1:])+1)
    for i in range(1,len(x)):
        ans+=10**i*((int('0'+x[:i])-10**(i-1))*10**(len(x)-i-1)*45+10**(len(x)-i-1)*int(x[i])*(int(x[i])-1)//2+int(x[i])*(int('0'+x[i+1:])+1))
    return ans
T=[]
for i in range(1,25):
    T.append(slv2('9'*i))
def slv(x):
    ans=slv2(x)
    for i in range(1,len(x)):
        ans+=T[i-1]
    return ans
n=int(input())
for _ in range(n):
    l,r=map(int,input().split())
    print((slv(str(r))-slv(str(l-1)))%MOD)