uva 621 - Secret Research

#include<iostream>
#include<string>
#include<stdio.h>
using namespace std;
int main(){
int n;
cin>>n;
getchar();
while(n--){
string l;
getline(cin,l);
if(l=="1"||l=="4"||l=="78"){
cout<<"+"<<endl;
}
else if(l[l.size()-1]=='5'&&l[l.size()-2]=='3')
cout<<"-"<<endl;
else if(l[0]=='9'&&l[l.size()-1]=='4')
cout<<"*"<<endl;
else if(l[0]=='1'&&l[1]=='9'&&l[2]=='0')
cout<<"?"<<endl;

}
}