UVa - 10252 - Common Permutation

#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
    string a,b,aux;
    int tama,tamb;
    while(getline(cin,a) && getline(cin,b))
    {
        tama = a.size();
        tamb = b.size();
        sort(a.begin(),a.end());
        sort(b.begin(),b.end());
        string sol = "";
        int i ,j = 0;
        for(i = 0; i<tama && j<tamb; i++)
            while(j<tamb && a[i]>=b[j])
            {
                if(b[j]==a[i])
                {
                    sol += a[i];
                    j++;
                    break;
                }
                j++;
            }
        cout << sol<<endl;
    }
    return 0;
}