Uva 10106- Product

/*                                                CODEMAN
                                              Arif Khan Nihar
                                             Uva 10106- Product
                                             date -> 17/10/2016

                                             */

#include<bits/stdc++.h>

using namespace std;
string res[501];
string add(string s1,string s2,int n1);

string multiply(string st1,int n){
          string s = "";
    int l = 0 , c = 0 , ll = 0;
    for(int i = 0; i < st1.size() ; i++) {
        l = ((st1[i]-48) * n)+l;
        if( l > 9) ll = l % 10,l /= 10;
        else ll = l,l=0;
        s += (ll + 48);
    }
    if(l != 0) s += (l+48) ;

    return s;
}
string convert_length(string sd,string st,int t){
    string ssd="",ssf="";
    for(int i = 0; i < st.size()+t ; i++){
            if(i < t)
            ssd  += sd[i];
            else
            ssd  += st[i-t];
    }
    ssf  = add(sd,ssd,t);
    return ssf;
}
string add(string s1,string s2,int t1){
    string rs;
    int l = 0,k = 0,c = 0;
    k = max(s1.size(),s2.size());
    for(int i = 0 ;i < t1; i++) rs += s2[i];
    for(int i = t1; i < k ;i++){
        if(i > s1.size()-1){
            l = (s2[i] - 48) + c,c = 0;
        }else if(i > s2.size()-1){
              l = (s1[i] - 48) + c,c = 0;
        }else{
          l = (s1[i]-48)+(s2[i]-48) + c,c = 0;
        }
        if(l > 9) {
            l = l-10,c = 1;
        }
        rs += l + 48;
    }
    if(c == 1)rs += "1",c = 0;
    return rs;
}

string prot(string s,string s1){
    int j,j1 = 0, p = 0,l = 0;
    string s4 = "";
    reverse(s.begin(),s.end());
     reverse(s1.begin(),s1.end());
     if(s.size() < s1.size()) swap(s,s1);
                for( j = 0;  j <  s1.size() ; j++ ) {
                        res[j] += multiply(s,(s1[j]-48)) , p++;
        }
        if(p == 1)
            s4 = res[0];
        else if(p == 2){
            s4 = convert_length(res[0],res[1],1);
        }
        else{
        for( j1 = 2; j1 <= p ; j1++,l++)
            res[j1-1] = convert_length(res[j1-2],res[j1-1],l+1);

        s4 = res[j1-2];
    }
        reverse(s4.begin(),s4.end());
        return s4;
}

int main()
{
    string s,s1;
    while(cin >> s >> s1) {
            string ss = "",ss1 = "";
            if(s[0] != '0')
               ss = s;
             else{
                for (int i = 0; i < s.size() ; i++)
                    if(s[i] == '0' and ss.empty())
                       continue;
                    else ss += s[i];
             }
           if(s1[0] != '0')
               ss1 = s1;
             else{
                for (int i = 0; i < s1.size() ; i++)
                    if(s1[i] == '0' and ss1.empty())
                       continue;
                    else ss1 += s1[i];
             }
            if(ss.size() != 0 and ss1.size() != 0 )
            cout << prot(ss,ss1) << endl;
            else
            cout << "0" << endl;

           ss.clear(),ss1.clear();

    for(int i = 0 ; i < 501 ; i++)
      res[i].clear();
 }
    return 0;
}