#include <stdio.h>

int main() {
  long long a, b, ans, judge=0;
  scanf("%lld %lld", &a, &b);

  ans=a*b;
  
  if (a/10!=0 && a!=10) {
    while (a) {
      if (a%10!=0) judge++;
      a/=10;
    }
  }

  if (b/10!=0 && b!=10) {
    while (b) {
      if (b%10!=0) judge++;
      b/=10;
    }
  }

  if (judge==2) printf("%lld\n", ans/10);
  else {
    if (ans>99999999 || ans<-99999999) printf("E\n");
    else printf("%d\n", ans);
  }
  return 0;
}