#include <iostream>
#include <cstdio>
using namespace std;
#define y1 Y1
const int dx[]={-2,-2,-1,1,2,2,1-1};
const int dy[]={-1,1,2,2,1,-1,-2,-2};
void get_k(char x,char y,int &xk,int &yk)
{
    xk=x-97;
    yk=y-49;
}
bool lad(int xb,int yb,int xk,int yk)
{
    return xb==xk || yb==yk;
}
bool kon(int xb,int yb,int xk,int yk)
{
    for(int q=0;q<8;q++)
        if (xb+dx[q]==xk && yb+dy[q]==yk) return true;
    return false;
}
char xt1,yt1,xt2,yt2;
int x1,y1,x2,y2;
int main()
{
    cin>>xt1>>yt1>>xt2>>yt2;
    get_k(xt1,yt1,x1,y1);
    get_k(xt2,yt2,x2,y2);
    //cout<<x1<<" "<<y1<<" "<<x2<<" "<<y2<<endl;
    if (lad(x1,y1,x2,y2) || kon(x2,y2,x1,y1))
    {
        cout<<0;
        return 0;
    }
    int ans=0;
    for(int i=0;i<8;i++)
        for(int j=0;j<8;j++)
        {
            if (i==x1 && j==y1 || i==x2 && j==y2) continue;
            if(!lad(x1,y1,i,j) && !kon(x2,y2,i,j) && !kon(i,j,x1,y1)) ans++;
        }
    cout<<ans;
    return 0;
}