# include<bits/stdc++.h>

using namespace std;
# define l long long 
# define db double 
# define rep(i,a,b) for(l i=a;i<b;i++)
# define vi vector<l>
# define vvi vector<vi>
# define vsi vector<set<l> >
# define pb push_back
# define mp make_pair
# define ss second
# define ff first
# define pii pair<l,l>
# define trvi(v,it) for(vi::iterator it=v.begin();it!=v.end();++it)
# define read(a) freopen(a,"r",stdin)
# define write(a) freopen(a,"w",stdout)
# define io ios::sync_with_stdio(false)

template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ' ' << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
 

#ifdef KRISHNAN_DEBUG
void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

const bool MULTIPLE_TEST_CASES = false;

const l MOD=1e9+7;
const l N=1e5+5;
const l INF=1e12;

l n,m;

map<pii,char> edges;
l both_count=0;
l same_count = 0;

void handleAction() {
	char ch;
	cin>>ch;
	dbg(ch);
	if(ch=='+') {
		l u,v;
		char c;
		cin>>u>>v>>c;
		edges[{u,v}] = c;
		if(edges.count({v,u})) {
			both_count++;
			if(edges[{v,u}]==c) {
				same_count++;
			}
		}
		
		
	} else if(ch=='-') {
		l u,v;
		cin>>u>>v;
		
		if(edges.count({v,u})) {
			both_count--;
			if(edges[{u,v}]==edges[{v,u}]) {
				same_count--;
			}
		}
		edges.erase({u,v});

	} else if(ch=='?') {
		l size;
		cin>>size;
		cout<<((size%2==0?same_count:both_count)>0?"YES\n":"NO\n");
		
	}
}

void solve() {
	cin>>n>>m;
	rep(i,0,m) {
		handleAction();
	}


	return;
}


int main(){
	io;
	int t=1;
	if (MULTIPLE_TEST_CASES) cin>>t;
	rep(i,0,t) {
		solve();
	}

	return 0;
}

