7-7 抓老鼠啊~亏了还是赚了？ (20 分)

#include 
using namespace std;
int main(){
    char op;
    int sad = 0, happy = 0, unhappy = 0, a = 0, b = 0;
    while(cin >> op) {
        if(op == '$') break;
        if(sad && !happy) {
            cout << "-";
            sad--;
        } else if(unhappy && !happy) {
            cout << "-";
            unhappy--;
        } else {
            if(happy) happy--;
            switch(op) {
                case 'X': cout << "U"; unhappy = 1; break;
                case 'T': cout << "D"; sad = 2, a++; break;
                case 'C': cout << "!"; happy = 2;b++;break;
            }
        }
    }
    cout << endl;
    cout << 7*a-3*b << endl;
    return 0;
}