awdaaaaaaaaaaaaa

#include <iostream>
#include <string>
using namespace std;
int main() {
    string s;
    cin >> s;
    if (s[1]=='+') {
        if (s[0]=='x') cout << s[4]-s[2];
        if (s[2]=='x') cout << s[4]-s[0];
        if (s[4]=='x') cout << s[0]+s[2]-96;
    } else {
        if (s[0]=='x') cout << s[4]+s[2]-96;
        if (s[2]=='x') cout << s[0]-s[4];
        if (s[4]=='x') cout << s[0]-s[2];
    }
}