1

#include <bits/stdc++.h>

using namespace std;

//int parent[300001], a[300001];
vector < pair < int, int > > minyc;
map <pair <int, int>, pair <int, int> > a, b;

int main()
{
    int i, k, n, kol, v1, v2, q;
    char bu;
    cin >> n >> q;
    for (int t = 0; t < q; t++)
    {
        cin >> bu;
        if (bu == '+')
        {
            cin >> v1 >> v2;
            a[{v2,v1}].insert({v1, v2});
            a[{v1,v2}].insert({v2, v1});
        }
        if (bu == '-')
        {
            cin >> v1 >> v2;
            b[{v2, v1}].insert({v1, v2});
            b[{v1, v2}].insert({v2, v1});
        }
        if (bu == '?')
        {
            cin >> v1 >> v2;
            if (a[{v1,v2}].count({v1, v2}))
            {
                cout << "+\n";
                continue;
            }
            if (b[{v1, v2}].count({v1, v2}))
            {
                cout << "-\n";
                continue;
            }
            cout << "?\n";
        }
    }
    return 0;
}