#include <bits/stdc++.h>
using namespace std;
main(){
  int x[3],t,u,P,Q;char S,T;
  cin>>x[0]>>x[1]>>x[2]>>S>>t>>T>>u;
  P=x[S-65]-t,Q=x[T-65]-u;
  cout<<min({t+u-1,P+Q+1,min(t+Q,P+u)+min({x[0],x[1],x[2]}),S==T?abs(t-u):2<<29})<<endl;
}