int main(){
int i,a,b,t;
char s[5];
for(i=0;i<30000;i++)h1[i]=i+1;
while(scanf("%d %s",&a,s)!=EOF){
while(l2>0&&m[h2[0]]<a){
t=get2();
m[t]=0;
add1(t);
}
if(s[0]=='+'){
t=get1();
printf("%d\n",t);
m[t]=a+599;
add2(t);
}else{
scanf("%d",&b);
if(m[b]==0)printf("-\n");
else{
printf("+\n");
m[b]=a+599;
adj2(b);
}
}
}
return 0;
}
bool circuit::goodCircuit()
{
matrix<int> adj2 = circuit_graph.adjacency_matrix();
adj2 = adj2*adj2;
for(int i=0;i<circuit_graph.nVertices();i++) if(adj2(i,i)<2) return false;
return circuit_graph.isConnected();
}
int get2(){
int r=h2[0];
l2--;
if(l2==0)return r;
h2[0]=h2[l2];
p2[h2[0]]=0;
adj2(h2[0]);
return r;
}