#include<bits/stdc++.h>
using namespace std;
int d[200]={0,3,4,8,9,14,23}; 
int main()
{
	char a,b;
	cin>>a>>b;
	int x=a-'A',y=b-'A';
	cout<<abs(d[y]-d[x]);
	return 0;
}