contest3.A.cpp

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
  string S;
  for(cin >> S; S != "END"; cin >> S) {
    int pos = S.find('+');
    if(pos == -1) {
      pos = S.find('*');
    }

    string A = S.substr(0, pos);
    string B = S.substr(pos + 1);
    reverse(A.begin(), A.end());
    reverse(B.begin(), B.end());

    vector<int> C(200, 0);
    if(S[pos] == '+') {
      for(int i = 0; i < A.size(); i++) {
        C[i] += A[i] - '0';
      }
      for(int i = 0; i < B.size(); i++) {
        C[i] += B[i] - '0';
      }
    } else {
      for(int i = 0; i < A.size(); i++) {
        for(int j = 0; j < B.size(); j++) {
          C[i + j] += (A[i] - '0') * (B[j] - '0');
        }
      }
    }

    int carry = 0;
    for(int i = 0; i < 200; i++) {
      C[i] += carry;
      carry = C[i] / 10;
      C[i] %= 10;
    }

    while(C.size() > 1 && C.back() == 0) {
      C.resize(C.size() - 1);
    }

    for(int i = C.size() - 1; i >= 0; i--) {
      cout << (char)('0' + C[i]);
    }
    cout << '\n';
  }
  return 0;
}