A,B=map(int,input().split())

flag=0

for x in [A,B]:
    while x%10==0:
        x//=10

    if abs(x)<=9:
        flag+=1

if flag==2:
    print(A*B//10)
else:
    ANS=A*B

    if -99999999<=ANS<=99999999:
        print(ANS)
    else:
        print("E")