简单模拟
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
int R1,R2,R3,M1,M2;
string s;
while(cin>>M1>>M2>>s){
R1=R2=R3=0;
for(int i=0;i<s.size();i++){
if(s[i]=='A') R1=M1;
if(s[i]=='B') R2=M2;
if(s[i]=='C') M1=R3;
if(s[i]=='D') M2=R3;
if(s[i]=='E') R3=R1+R2;
if(s[i]=='F') R3=R1-R2;
}
cout<<M1<<','<<M2<<endl;
}
return 0;
}