#!/usr/bin/env pypy3 CALC_LIMIT = 99999999 def by_hand(x, y): return x * y // 10 def by_calc(x, y): res = x * y if abs(res) > CALC_LIMIT: return None else: return res def judge(x): x = abs(x) n = 0 while x % 10 == 0: x //= 10 n += 1 return 1 <= x <= 9 and n >= 2 def solve(x, y): if judge(x) and judge(y): res = by_hand(x, y) else: res = by_calc(x, y) return res def main(): x, y = (int(z) for z in input().split()) res = solve(x, y) if res is None: print("E") else: print(res) if __name__ == '__main__': main()