from collections import defaultdict
import sys,heapq,bisect,math,itertools,string,queue,datetime
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
AtoZ = [chr(i) for i in range(65,65+26)]
atoz = [chr(i) for i in range(97,97+26)]

def inpl(): return list(map(int, input().split()))
def inpl_str(): return list(input().split())

A,B = inpl()
AA = abs(A)
BB = abs(B)

flag = True
while AA >= 10:
	if AA%10 == 0:
		AA //= 10
	else:
		flag = False
		break
while BB >= 10:
	if BB%10 == 0:
		BB //= 10
	else:
		flag = False
		break

if flag:
	print(A*B//10)
else:
	ans = A*B
	if -99999999 <= ans <= 99999999:
		print(ans)
	else:
		print('E')