Baltic_ACM_ICPC_A

// Baltic ACM ICPC A
#include <iostream>
using namespace std;
int main()
{
    int n, ac1=0, bc1=0, ac2=0, bc2=0;
    char c[1001];
    cin >> n;
    if(n%2!=0)
    {
        cout << "Impossible" << endl;
    }
    else
    {
        for(int i=0;i<n/2;i++)
        {
            cin >> c[i];
            if(c[i]=='a'){ac1+=1;}
            else if(c[i]=='b'){bc1+=1;}
        }
        for(int j=n/2;j<n;j++)
        {
            cin >> c[j];
            if(c[j]=='a'){ac2+=1;}
            else if(c[j]=='b'){bc2+=1;}
        }
        if((ac1+ac2)%2==0 && (bc1+bc2)%2==0 && ac1==ac2 && bc1==bc2)
        {
            for(int y=0;y<n;y++)
            {
                cout << c[y];
                if(y!=n-1 && y!=(n/2)-1){cout << "+";}
                if(y==(n/2)-1){cout<<"=";}
            }
        }
        else
        {
            cout << "Impossible" << endl;
        }
    }
    return 0;
}