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- #include <iostream>
- #include <algorithm>
- using namespace std;
- int main()
- {
- int a, b, c, d;
- cin >> a >> b >> c >> d;
- int s1 = b + c + d;
- int s2 = a + c + d;
- int s3 = a + b + d;
- int s4 = a + b + c;
- int parni = 0;
- if(s1 % 2 == 0) {
- parni += 1;
- }
- if(s2 % 2 == 0) {
- parni += 1;
- }
- if(s3 % 2 == 0) {
- parni += 1;
- }
- if(s4 % 2 == 0) {
- parni += 1;
- }
- if(parni == 1) {
- cout << "+" << endl;
- }
- else if(parni == 0) {
- cout << "-" << endl;
- }
- else {
- cout << "?" << endl;
- }
- return 0;
- }
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