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

a = set(str(abs(A))[1:])
b = set(str(abs(A))[1:])

if len(a) == 1 and len(b) == 1 and A % 10 == 0 and B % 10 == 0 and (A > 99 or A < -99) and (B > 99 or B < -99):
    X = A * B // 10 
else:
    if -99999999 <= A * B <= 99999999:
        X = A * B
    else:
        X = 'E'

print(X)