import sys
input = sys.stdin.readline

mod=998244353               


T=int(input())

for tests in range(T):
    N,K=map(int,input().split())
    N-=1
    x=10**K

    q=N//x

    #print(q)

    kei=[0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9]

    lastkei=(q-1)//2

    if q%2==0:
        kei=(1+lastkei)*lastkei
    else:
        kei=(1+lastkei-1)*(lastkei-1)+lastkei

    #print(kei)
    S=x//2-1
    SUM=(1+S)*S*kei
    #print(SUM)

    kou=(N+1)%x
    if kou==0:
        kou=x

    #print(kou)

    ss=kou//2

    A=(S+S-(ss-1))*ss
    if kou%2==1:
        B=S-ss
    else:
        B=0

    #print(SUM,A,B,SUM+(A+B)*(q//2))

    ANS=SUM+(A+B)*(q//2)

    print(ANS%mod)