#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define eb emplace_back
#define pb push_back
#define pii pair<int,int>
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")

using namespace std;

vector<int> p;
vector<int> sz;
vector< set<int> > s;

int get_par(int v){
	if(p[v]==v) return v;
	p[v] = get_par(p[v]);
	return p[v];
}

void unite(int a, int b){
	a = get_par(a);
	b = get_par(b);
	if(a==b) return;
	if(sz[a]<sz[b]) swap(a,b);
	//a is par
	sz[a]+=sz[b];
	p[b] = a;
	if(s[a].size()<s[b].size()){
		swap(s[a],s[b]);
	}
	for(auto t:s[b]){
		s[a].insert(get_par(t));
	}
}

main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n,k;
	cin>>n>>k;
	sz.resize(n,1);
	s.resize(n,set<int>());
	p.resize(n);
	for(int i = 0; i < n; i++) p[i] = i;

	for(int i = 0; i < k; i++){
		char c;
		int a,b;
		cin>>c>>a>>b;
		a--;b--;
		if(c=='+') unite(a,b);
		else if(c=='-'){
			a = get_par(a);
			b = get_par(b);
			s[b].insert(a);
			s[a].insert(b);
		}else{
			a = get_par(a);
			b = get_par(b);
			if(a==b){
				cout<<"+\n";
			}else if(s[a].find(b)!=s[a].end() || s[b].find(a)!=s[b].end()){
				cout<<"-\n";
			}else{
				cout<<"?\n";
			}
		}
	}


}