#include <bits/stdc++.h>

using namespace std;

#define all(X) (X).begin(), (X).end()
#define pb push_back
#define rall(X) (X).rbegin(), (X).rend()
#define ll long long
#define ull unsigned long long
#define ld long double
#define fir first
#define sec second

const int nmax = 2e5;
map<ll, ll> p;
map<ll, set<ll>> mp;

void init() {
	for (ll i = 0; i < nmax; i++) {
		p[i] = i;
	}
}

ll get(ll a) {
	if (p[a] == a)
		return a;
	else
		return p[a] = get(p[a]);
}

void unon(ll a, ll b) {
	for (auto i: mp[b]) {
		mp[a].insert(i);
	}
	mp[b].clear();
}

void unit(ll a, ll b) {
	a = get(a);
	b = get(b);
	if (a < b) {
		p[b] = a;
		unon(a, b);
	} else {
		p[a] = b;
		unon(b, a);
	}
}

int main() {
	init();
	ll n, m; cin >> n >> m;

	for (ll i = 0; i < m; i++) {
		char q; cin >> q;
		if (q == '+') {
			ll a, b; cin >> a >> b;
			unit(a, b);
		} else if (q == '-') {
			ll a, b; cin >> a >> b;
			a = get(a);
			b = get(b);
			mp[a].insert(b);
			mp[b].insert(a);
		} else {
			ll a, b; cin >> a >> b;
			if (get(a) == get(b))
				cout << "+\n";
			else if (mp[get(a)].find((get(b))) != mp[get(a)].end())
				cout << "-\n";
			else
				cout << "?\n";
		}
	}
	return 0;
}