杭电acm1283

#include<iostream>  
#include<string>  
using namespace std;  
  
int main()  
{  
    int m1,m2,r1,r2,r3;  
    string str;  
    char ch;  
    while(~scanf("%d%d",&m1,&m2))  
    {  
        cin>>str;  
        r1=r2=r3=0;  
        for(int i=0;i<str.length();i++)  
        {  
            ch=str[i];  
            switch(ch)  
            {  
                case 'A':r1=m1;break;  
                case 'B':r2=m2;break;  
                case 'C':m1=r3;break;  
                case 'D':m2=r3;break;  
                case 'E':r3=r1+r2;break;  
                case 'F':r3=r1-r2;break;  
            }  
        }  
        printf("%d,%d\n",m1,m2);  
    }  
    return 0;  
}