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- #include <iostream>
- using namespace std;
- int main()
- {
- int a, b, c, d;
- cin >> a >> b >> c >> d;
- int bez_a = b + c + d;
- int bez_b = a + c + d;
- int bez_c = a + b + d;
- int bez_d = a + b + c;
- int temporary_plus = 0;
- if(bez_a % 2 == 0)
- {
- temporary_plus++;
- }
- if(bez_b % 2 == 0)
- {
- temporary_plus++;
- }
- if(bez_c % 2 == 0)
- {
- temporary_plus++;
- }
- if(bez_d % 2 == 0)
- {
- temporary_plus++;
- }
- if(temporary_plus == 0)
- {
- cout << "-" << endl;
- }
- else if(temporary_plus == 1)
- {
- cout << "+" << endl;
- }
- else
- {
- cout << "?" << endl;
- }
- return 0;
- }
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