def isAnzan(n: int) -> bool:
    n = abs(n)
    if n<100:
        return False

    res = n
    rem = 0
    i = 0
    while res > 0:
        rem += res%10
        res //= 10
        i += 1
        
    if n == rem*10**(i-1):
        return True
    else:
        return False
    
A, B = map(int, input().split())

if isAnzan(A) and isAnzan(B):
    print(A*B//10)
else:
    if abs(A*B)<10**8:
        print(A*B)
    else:
        print("E")